If you're looking to enable PTO approvals, you will need to do this from within each employee profile.
1. Visit the employees profile that you'd like to enable PTO approvals for.
2. Once in the users profile, select "Edit" located in the upper right hand corner:
3. You will want to check the box next to "Requires approval for PTO requests" and then click "Save."
You will repeat this for each employee that you'd like to enable PTO approvals for.