1. Go to HR Tools > Employees > Profiles and click + Add new (or the profile's ID to edit).
2. Enter a Name (e.g. Kitchen Manager).
3. Each permission group (Base, Employees, POS, Accounting, ...) is a panel with a Toggle All switch; tick the individual permissions the profile should have.
4. Click Save.

The name cannot be empty ("Name empty"). Every permission you add or remove is written to the activity log with your name attached.