tak bisa merubah Dashboard

tolong di bantu saya tidak bisa edit wordpressnya ada tulisan ini ,,Warning: Cannot modify header information – headers already sent by (output started at /home/neger2hp/public_html/wp-content/plugins/affiliate-link-manager/index.php:1) in /home/neger2hp/public_html/wp-includes/pluggable.php on line 876 bagaimana memperbaikinya terima kasih