The problem is not with imagefap. VEF forum software is programmed to block hot links to other forums, blogs, torrent, and streaming sites.
You must first download the image onto your hard-drive, and then re-host it at a VEF approved image host. Those hosts also have a maximum permitted file-size for GIF's.
Check the VEF Rules, and the Tutorials in the VEF Help section.
VEF Rules:
http://vintage-erotica-forum.com/t16...guideline.html
VEF Help Section - Tutorials:
http://vintage-erotica-forum.com/f27-tutorials.html