No puedo cerrar sesion en mi blog wordpress

Hola haber si me explico bien.
Resulta que quería cambiar la url de mi blog y bueno no e sido capaz y he echado marcha atrás.
El tema es que ahora abro bien el blog pero al cerrar sesión me sale una ventana de errores.
El blog queestecnologia.com
Os pongo aquí: estas líneas me salen con el navegador internet explorer
Con chrome me sale solo esta línea:Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 1121

Lineas en Internet explorer:
Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-login.php on line 414

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-login.php on line 426

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 883

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 884

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 885

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 886

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 887

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 888

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 891

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 892

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 893

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 894

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 897

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 898

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 899

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 900

Warning: Cannot modify header information – headers already sent by (output started at /home4/xalitre/public_html/queestecnologia.com/wp-config.php:1) in /home4/xalitre/public_html/queestecnologia.com/wp-includes/pluggable.php on line 1121