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how u do that
and how u make login and post systems?
If you're going to code it yourself, its a rather big project.
www.phpbb.com is a good free one though. Download and install according to their instructions. You need a server with PHP and MySQL, though.
And if u just want to have ure own forums, just go to www.phpbbboards.com or www.invisionfree.com and get ure own free forum today.