MyTime Account > Setup > Settings > Staff
While in your MyTime account, you can turn on tracking in the "Settings" page under "Setup." From there, scroll to the bottom of the page and turn on both "Can customers book a specific staff member?" and "Track compensation by staff member?"
Once both these options are turned on, your MyTime profile will start tracking their compensation. You can also require that they clock in and out and set different prices per staff member.