To reach the Archive tab, click the My Positions tab and to the right you will see the Archive Tab. A common reason why you will use the Archive will be to retrieve applicants if you unposted a position. Applicants in the Archive work similarly to applicants under the live postings in the "My Positions" tab. You can click on a position in the Archive to see the overview of how applicants stack up against one another.
Remember, all the actions that you would take under the My Positions tab are able to be taken in the Archive. You can view an applicant profile, their hard and soft skills, responses to virtual interview questions, request an interview, verify references, hire and reject.