Could আপনি give me a website where আপনি can chat with বন্ধু for free?

DeviantART has a chat, I think.

Real life personal friends?
আপনি can just downloas instant messangers, like Windows Live, AOL, অথবা Yahoo. It's possible that your computer came with at least one already downloaded. আপনি can chat with pretty much any friend with an account of anything, অথবা either program.
আপনি can also download Tango অথবা Skype.
I know there are websites where আপনি can open a privat chat rooms where আপনি can invite friends, but I don't know the names of any.

If you're looking to make new বন্ধু online, আপনি can go pretty much anywhere, just follow basic internet safety.
I used to go into Yahoo multi-player game rooms to talk to people. It was fun.