When individual changes have been made to a work shift/schedule, it is important to inform the employees.
In the Weekly Overview - where these changes are often made - there is a tool called "Changes" or "Inform of changes".
When using this tool you are sending a message/notification to your employees. The message tells the employees to double check their schedule via the link in the message sent. The link will take them to their Timeplan-app.
The button to send messages to employees you will find in the top right corner of the weekly overview. When pressing this you will get a list where you can select which employees you want to notify. The ticked employees will get the notifications.