Hi there im new to visual basic and need ur help!

Im trying to create a change password dialog with 3 textboxes. One for username, old password and new password. I've sucessfully connected to the MS Access 2000 database with MS jet 4.0 but dont the vb code to complete the dialog box. Inside the database each record represents one person. And theres two columns, 1 for username and password. They are called StaffUserName and StaffPassword. OK heres the scenario

1. User enters their data into all 3 boxes
2. vb using text in text box for username searches database for identical username in database. If not msgbox saying Username is incorrect
3. database fixes onto that specific record.
4. vb code saying if both username and password in textboxes matches database fields. StaffPassword changes to value in NewPassword textbox
5. msgbox saying change complete

If n e 1 can help me i would apreciate it very much. I need this for a college project! Thanx