Yep, flash works on any forum where HTML is not disabled by the administrator(s). :points to own signature:
I know a few things but honestly I think BannerSnack is actually really good for beginners (as to say, if you're not a coder or dev), honestly it's actually really noob-friendly and I kinda liked it. Just stick with it, it's your best bet.
Edited in: Wait, are u using Iframe embedding? That shit never works anywhere. Just click the "Classic" option instead then copy that code.