Need help with my PHP assignment.

I am making a website. Can you walk me through this part of the project? https://razorlovestocode.com/CMS/index.php this is my website. Yes, I know it needs A LOT of work. But answering this question /part will help me.

An account management solution and login page is required. The login account will facilitate customers, publishers, and administrators. Access levels for each should be stored in a session. a. The username and password should match this exactly: i. Username = admin Password = admin (without the quotes) ii. publisher publisher for the publisher account iii. customer customer for the customer account