Her presentation covered all the information you need on how to participate. Audio starts around the 1 minute mark on this video.
Interested anglers measure the length of a fish, collect several scales (even catch and release fish can be sampled), record the species of fish, and note the area where caught. Scales and information are sent to Marine Fisheries to use in determining the age of each fish. Watch the video for all the details and find out how long it takes those fish to reach legal “keeper” size.