If you need to change a shift that’s already in the schedule, simply click on the shift in the schedule (avoid clicking on the employee name or the time). A window will open and allow you to assign the shift to another employee or change it to an open shift. You can also change the hours, the shift type and if and how to track breaks.
For special circumstances, you can even make sure that the person working this particular shift will get a special pay rate by entering a custom hourly wage in the relevant tab.
For a quick and consistent update, you can apply the changes to similar future shifts from this window too.
Make sure you send an automated message to any employee(s) affected by the edited shift by checking one of the boxes above the Save button.
You can edit the wording of the automated messages in Settings > Schedule > Communication.