It depends on the forum software as to whether you need php and mysql...
As far as getting it working and uploaded.. you'll need an ftp client (and ftp access to your webspace

)
you may well need to play with some "chmod" changes.. which are effectively file permissions.
If you need help, let me know and i'll give you a hand..
Also, if you're trying to set up a forum using php/mysql on your NTL webspace.. i'll save you the trouble of finding out that it doesn't work.. because you'll have no scripting support.
On the other hand, If you ask nicely i might be able to set up a forum for you.. but we can discuss the details