By default the People module is only available to administrators.  

After opening the people module you'll see the list of all active personnel profiles in the system.

Double clicking on any entry in the list will bring up the Personnel Profile for that individual.

View inactive profiles

Inactive user profiles are hidden by default in the People listing.  If you need to view inactive personnel profiles (for example to reactivate them) click on the filter icon next to the "Is Active" label and check "Select All" from the window that pops up

Once an inactive profile is visible you can open it to set the "Is Active?" flag again which will reactivate it.  You can make any other changes as well without reactivating the account.