Because you have 10 teams, the system wants you to enter five  timeslots to be able to create a schedule.  Add a "fake" timeslot at the end of your current set of timeslots.  At the bottom of the TimeSlot page, you will see the green circles for this "fake" timeslot.  Click each one off (they will turn grey).  This will push the schedule into the next week and beyond if necessary.  Then go to Create Schedule and generate a new schedule for the 10 teams.