Mysql database issue

Hi all,

Please am a newbie when it comes to php and forms, I have created a site with a registration and login forms and I have equally created mysql database and table for the form inside mysql server but I need the database to take the data from the registration form and store it, and at the same time when the user login it will bring the their data to them. But I don't know how to connect it with form on my site and have it on my rootfolder/local server.  I will really appreciate if anyone can help out.