I need to add a forum to my website?????

I want to know how can i add a forum to my website. which can work with same database and same login and password of the existing member.

or members no need to login again and again

So you have a website inwhich users log into and now you want to impliment a forum with the same username and passwords for current users?

What kind of site do you have currently?

It would make more sense creating a new data base and making users sign up again making it so the forums db and the main db are under the sme data base otherwise your looking at spending time migrating two databases together.

For an existing website, you would want to find a forum that integrates with your platform. If you'd rather go the other way around, I'd suggest setup the forum first, then look into how to make the website integrate with it.

In example, once upon a time I had a forum and a website. We had a custom server control panel on the website and we didn't want to re-build an authentication system with role/permission management. At that time, we were using MyBB for our forum so, after several hours of googling, some trials and errors, we were able to integrate the main website login system with that of MyBB and our staff were able to effortlessly login, manage server punishments etc.

You could make a script which exports your users from the website and imports them in the forum database. Also, running it as a cron, will make any newly created account on the site to also be added to the forum