(Reposting (most of) my post from
UBB.Central)
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 hire a developer (such as myself as inquired via PT) as modifying a product one isn't familliar with would likely take some time.
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.
(btw, TRYING to get this all done via PT)