Any forum that matches these criteria?

Here is what I want

Free domain, hosting, ad free forum

http://www.phpbb3now.com satisfies the above criteria but I want to be able to put my own code in it, may be ads, banners or something like that. Is it possible to do it at that site by editing the forum template or something like that?

And, it is easy to move the whole forum created there onto a custom domain later on?