Useful app for work schedule

I like using this app better than my iPhone calendar for my work schedules. I work three jobs and it can be confusing. My one issue is not being able to delete a scheduled work day after I enter it. Does anyone know how to do that?
*How do you delete a schedule? I entered a shift but then it changed and I cant figure out how to delete it! Why is this so difficult?

Fab LeeLee about WorkTime: Shift Work Calendar