Pay with a like working with custom fields

I got the pay per like to work on my website but how do get it do work with custom fields. For example, my template allows me to add Vimeo videos into a custom field (not in the post description), for an example look at this post http://themes.okaythemes.com/radius/2012/03/04/the-city/ I would like to members to link before seeing the entire content including the video... at the moment it only blocks the content below video. How can I achieve this??