As of 18 March, 2011, new FBML apps can no longer be added to Facebook pages. However, existing FBML subscribe forms will continue to work.
It has always been easy to put a signup form onto a standard web page, just by copying and pasting the form code from your account. Now it is almost as easy to add the same signup form to your Facebook fan page, and let your Facebook friends join your list. Our thanks go to the Return on Subscriber blog for providing the general instructions.
Basically it is just a container you can add your own HTML into.
Edit the FBML application and rename it
Click on ‘edit page’ from your pages profile, and find the FBML box. Click the pencil edit icon in the header.
Now you can paste in your form code, and add any introductory information, images or other design touches to your form.
Add the signup form as a tab on your page
To make it easier for your fans to find the form, you can add it as a navigation tab. Just click the “+” icon in the top navigation list, and select your new form from the list.
Now it is a standalone tab, and people can signup at any time.
To see it in action, visit the Campaign Monitor fan page. When we have our new shirts we’ll give a few away to our Facebook fans too, so it could pay off to add us. We’re not too proud for blatant bribery!