If you bought a steelhead card, whether you fished or not, you are required to return it to DFG by January 31. the address is
California Department of Fish and Game
Steelhead Catch Report-Restoration Card
P.O. Box 944209
Sacramento, CA 94244-2090
You can also do this online now if you don't mind setting up a login at DFG. Here is the
link.