GoPro Hero 4 session - To Secure the Camera in the Frame:

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TO SECURE THE CAMERA IN THE FRAME:
1. Open the latch.
2. Rotate the camera to the desired orientation, and then slide it into
the frame. The back of the frame has a raised edge. Be sure the
back of the camera sits flush against it.
3. Close the latch.
/ The Frames
PRO TIP: For added security during water activities, tether the frame
to the mount. On the Standard Frame, loop the tether over the small
bar behind the mounting fingers. On the Low-Profile Frame, loop the
tether through the points on the back corner of the frame. Camera
Tethers are sold separately.
/ The Frames