Edimax Technology QIG-ED-DB-0507-V11 - Manual (Page 4)

Try to press-and-pull the antenna bottom cover with your forefinger,
simultaneously; use your thumb at the same time to push up the antenna
bottom cover from the end.
After taking off the bottom cover, the screw holes on the cover can be used to
position and mark the selected site for this antenna in wall mount condition.
QIG-ED-DB-0507-V1 4