Buick 2001 LeSabre Owner's Manual page 193

Once you have loaded the discs in the magazine, slide
open the door of the compact disc (CD) changer. Push
the magazine into the changer in the direction of the
arrow marked on top of the magazine.
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Close the door by sliding it all the way to the right.
When the door is closed, the changer will begin
checking for discs in the magazine. This will continue
for up to one and a half minutes depending on the
number of discs loaded.
To eject the magazine from the player, slide the CD
changer door all the way open (to the left). The
magazine will automatically eject. Remember to keep
the door closed whenever possible to keep dirt and dust
from getting inside the changer.