Samsung NX20 - Locking or Unlocking the Lens

My Camera > Lenses
37
SAMSUNG 20-50 mm F3.5-5.6 ED II lens (example)
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No. Description
1
Lens mount index
2
Zoom lock switch
3
Lens
4
Focus ring (p. 72)
5
i-Function button (p. 51)
6
Zoom ring
7
Lens contacts
Locking or unlocking the lens
To lock the lens, pull and hold the zoom lock switch away from the
camera body and rotate the zoom ring clockwise.