Canon T50 Instructions Manual page 7

To mount the lens, first align the
red positioning point on the lens
with the red dot above the camera
mount as illustrated.
After mounting the lens, make
sure the lens release button has
popped out. Otherwise, the lens
will not work properly. DO NOT
press the lens release button
while mounting, or it may not
pop out.
Then turn the lens in the direction
of the arrow until it stops and the
lens release button pops out with a
click.
Be sure to place the lens with its
front end down (as illustrated) to
avoid damaging the protruding pins
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To dismount the lens, turn the lens
in the direction of the arrow while
pressing the lens release button.