Samsung NX300M - Locking or Unlocking the Lens

My Camera > Lenses
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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. 89)
5
i-Function button (p. 61)
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 as shown in the illustration.