Allowing a member to see/edit their details once logged in

Hi,

I'm sure there is a simple answer to this question. I am developing a members type site where I want a member to on login be directed to a page which displays a dymaic form allowing them to editonly their details but cant figure that part out.

I have the login page and form all working fine it's just how do i get the login info from the login page to call up their account details from a DB

I am using DWCS3 with Developer toolbox and am using PHP & MYSQL

Thanks in advance for your help