I somehow managed to add this "like" button to every product page (with the help of the addon), it kinda is there and kinda works... but every time somebody presses "like", the red "error" appears to the right, if you click on it it shows this:

The page failed to provide a valid list of administrators. It needs to specify the administrators using either a "fb:app_id" meta tag, or using a "fb:admins" meta tag to specify a comma-delimited list of Facebook users.
Facebook ©2012

Who can help me where in the code should I put the FB details (user? password?)

Site - www.a p t e k a r u s.com

Thanks in advance!