You'd need to craft a bbcode for the UBB to read the embed code; you'd likely also have to configure the application to display a tag for users to embed to your forum (as I said via PT)
Your best bet would be to inquire over at ubbdev (as modifications void ones ability to access support for their forum through the helpdesk here at central) or hire a developer (such as myself as inquired via PT)
You'll likely also need to contract someone who's got the ability to work with threads 7.3 as the bbcode developed for 7.2 will not function in it directly.
