Help me please!

Well, I was wondering if it was possible to insert data on a forum using the mozilla activex control.

Like with the WebBrowser you can do this:
WebBrowser1.Document.All("inputname").Value = "something"

I was wondering if you could do that with Mozilla's control..

Please help me, thanks =D.

What version of BASIC are you using?

With most commands you're usually safe just trying some code and seeing what happens. Usually you'll just get your BASIC's version of "what are you talking about?" if your code doesn't work.