The PlainStaff Mobile App can be switched into a multi-user mode and thus used as a "time clock" in the workplace. To do this, open the settings of the PlainStaff app and tap on "Multi-user mode":

Tapping on "Manage Users" takes you to the employee selection screen. Here, employees can be added by tapping on the + icon in the top right:

You must assign a 4-digit PIN for each employee, which they will use to log in at this terminal. Afterward, the employees will appear in the employee selection screen:
When employees tap on their icon in the employee selection screen, they enter their PIN and can immediately begin recording their times:
After recording their times, a tap on the "Logout" button is all it takes, and the next employee can record their times:

The complete login procedure of an employee as a video: