Flex ERGO Owner's Manual page 17

Connect the plinth for desk mounting
1 Make sure the lock tab is
moved to the Unlock position.
ergo
The plinth will give you a convenient and ergonomic viewing angle.
If you are going to place your phone on a desk or table, then attach
the plinth as shown below.
2 Slide the plinth into the lugs
marked Desk. Place the plinth
level with the bottom of the
phone.
3 Lock the plinth in position
by moving the tab to the
Lock position.
UK-4