What do I do if my awning is frozen?

The first thing is DO NOT OPERATE THE AWNING WHEN FROZEN, ESPECIALLY IF IT IS AN ELECTRIC AWNING! The possibility is the motor will unwind insde the cassette box which cannot open. Then, when the awning thaws, it could bounce out suddenly with great force causing damage.

Your awning should not be left open if freezing weather is expected.
It should not be left out in the snow.
If it is frozen do nothing until defrosted and, if you have attempted to unwind it, do not stand in front of the awning as a sudden thawing may cause the awning to spring open.

If in any doubt seek advice

Look up some advice here: