Warning: Cannot modify header information –

i have just started using wp.org a few weeks ago hosted by godaddy. The other day I tried to add Google’s adsense-immediately and thought everything went well. I log out to give everything time to set-up however, The next day i tried to log in to my admin at https://www.bestworkathomebusiness2011.com but was unable to. Godaddy told me to ask here. so here I am. This is what i got and can’t find a way in to get read of it. Warning: Cannot modify header information – headers already sent by (output started at /home/content/92/7533792/html/bestworkathomebusiness2011.com/wp-content/plugins/adsense-immediately/adsense-immediately.php:316) in /home/content/92/7533792/html/bestworkathomebusiness2011.com/wp-content/plugins/adsense-immediately/adsense-immediately.php on line 277

Warning: Cannot modify header information – headers already sent by (output started at /home/content/92/7533792/html/bestworkathomebusiness2011.com/wp-content/plugins/adsense-immediately/adsense-immediately.php:316) in /home/content/92/7533792/html/bestworkathomebusiness2011.com/wp-includes/pluggable.php on line 897

Please help. Like I said I am new at this so I’m sure I may need step by step.