Buick 1994 Skylark Owner's Manual page 96

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To signal a lane change, just raise or lower the lever
until the green arrow
starts
to flash. Hold it there until
you complete your lane change. The lever will return
by
itself when you release it.
As you signal a turn or a lane change, if the arrows don't
flash but just stay on, a signal bulb may be burned out
and other drivers won't see your turn signal.
If a bulb is burned out, replace it to help avoid an
accident. If the green arrows don't go on at all when you
signal a turn, check the fuse (see "Fuses" in the Index)
and for burned-out bulbs.