There are several different versions of Cintra People HR, which will control what you can see and do. These are:
Leave: The basic version which lets employees and managers handle employee leave.
HR Essentials: The mid-level version which provides all the functionality of Leave plus
HR Success: The top-level version which provides all the functionality except Time, which is a an add-on.
Time: An add-on that handles lets employees manage clock-in/out and timesheets, and the associated management functions.
Each relevant HR help article - including this one - will display in which versions of Cintra People HR the feature is available.
For more information on setting up these versions, see Selecting a setup guide.