How to show the data from a database

Hi guys, I'm fairly new to PHP and I've stumbled into a problem that I can't figure out how to solve, basically what I want to do is to have a user log in and when a user logs in using his login name and password that I have stored in a mysql table called users, then I want to show him the data that he has submitted before and that is stored in a mysql database and give him the ability to change that data, so if I for example have a directory I want the users listed in it to be able to change for example the description of their site and so on. Can anybody help me with this or if somebody has the code to do something like this send it to me. I would be really grateful for all the help, I sure need it. I've tried to find something about this in the manual but I really don't know what I need to do so that I can pull this off, kinda hard to find it then. :))))))