Step 1: Mark the Employee's shift as 'sick'.
Step 2: Find a replacement.
A) To simply assign the shift to someone else, click and drag the shift to another Employee. Once you publish the change, the Employee will be notified of their shift immediately by text and email.
B) To offer the shift to multiple people, click and drag the shift to the Open Shift area. Once you hit 'Publish', all Employees that can perform that Role will get notified that a shift is available.
In both cases, the Employee who is ill will still have the shift assigned to them (flagged as sick) to track their attendance accordingly.