To understand how Smartplan works you first of all need to plan and publish a rota
How to create an employee from the planningtool
Add shifts to your rota
Make the rota visible to your employees
Let your employees interact with the rota
You can also make shift swaps through the Smartplan app - here is a guide on how.
Learn how you as admin manage a shift swap submitted by your employees and how to perform swaps yourself