Expired certificate on admin account

I have customer with expired Administration certificate. Is it possible to get it re-certified or server must be reinstalled ?

Damir

Subject: Administrator ID has expired; no one can administer the Domino server

http://www-01.ibm.com/support/docview.wss?uid=swg21218490

I have found this procedure but please tell me how to do this:

Select the People view in the server’s Domino Directory, open the user’s Person document in Edit mode, and click the Certificates tab

Obviously I am missing something here.

Thank you,

Damir