i cannot help about the vBadvanced software as i have never used it my self! but you've got me interested so im going to have a look!
as to phpBB, its very simple to setup.
As you are already hosted, firstly, login to your cpanel
(https://YOURSITEHERE.astahost.com:2083)
2. scroll down to the bottom of the page and under pre-installed scripts, click fantastico (you can get there by going to the link, and substituting your site in (https://YOURSITEHERE.astahost.com:2083/frontend/rvblue/fantastico/index.php)
3. scroll down to discussion boards and select phpBB
4. then, on the left select the NEW INSTALLATION link (make sure there is enough space)
5. select a domain and folder location (the defaults are normally good, but if you want it in a separate folder you can put it in something like /forums)
6. enter a username and password that will become the admin account (this can be anything you want)
7. fill in the Site name, Short description, E-Mail signature, Admin e-mail, Preferred Language and click install
the installation should start and will only take a few seconds, you will then be asked to confirm the database information and click install again, click and you are done. if there are no errors, your forum is there! go to the link the it gives you and you can begin modifying to your needs. to login to the admin panel, go to the forum, login using the username and password supplied at the setup, scroll to the bottom and click the administration link, (you may need to enter your username and password again) and you will be redirected to the forums admin panel. There you can change anything on the board!
Good Luck and if you need to know anything about the pbpBB forums, don't hesitate to ask
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