In such Rule, you will choose the trigger "When a user signs in using a multistep kiosk station" and add a logical condition that says "Internal ID(which is the location ID) is Z-value".
Z-value is the name of the location in this case, in order to get this ID, please go to the location screen and search for the location you want to use to do the comparison, now look up in the URL to find the ID.
As you see below for example for Academic Building 7 this is the ID(highlighted):
2- In the section "What does it do" add an Action "Set action assignment as completed", now click EDIT
3-In the Edit Action screen set the user ID [[AttendanceLog.User.Id]] and select the Action Item to set as completed, in this example Change of Major.
4- Now write down some completion Notes and click Save.