The student Piazza interface is very similar to the instructor interface, but students will not see the course Manage Class tab at the top of the Q&A page:

In order to see the students' view of Piazza, you will need to create an account as a student. To do this, please follow these instructions. You will continue to have instructor privileges in the classes you are teaching on Piazza, but will only have student privileges in the classes in which you are enrolled as a student.

Instructor Accounts vs. Student Accounts