Select "Take a Job" section of the menu in your Done. Service Provider app;
This section will show you all of the available cleanings in your area sorted by day;
Tap a cleaning and scroll to the bottom;
Tap "Take a Job" and make sure that you'll be able to complete this cleaning on selected day.
If you don't see anything in the "Take a Job" section, it means there aren't any available cleanings at that moment. Check it again later.