To set up notifications for check-ins:

1. On the left panel of your admin dashboard, head to Check-Ins.

2. Click on the Option or Question Check-in tab.

3. Create a new check-in or edit an existing one. 

4. Scroll down to Check-In Settings.

5. Tick the Remind Employees to Check-In box. 

6. Select the times and frequency at which you want reminder notifications to be sent out. 

7. Confirm by clicking Confirm.