The top right hand side of the screen displays the Username you are logged in as (highlighted below).
To Clock In enter your Employee Login ID and password if required and tap the Clock In button.
This is the same Login ID and password you use to Clock In in the Factory.
You should see the following.
Note that it is possible to hide the green Clock In button and go straight to the above screen. For more information see Hiding the Green Clock In Button.
To Clock Out, tap on the three horizontal bars at the top left of the screen (see highlighted above).
You should see the following - click on Clock Out (highlighted below).