How Do I take the pledge?

You've taken the pledge when you put the first sunset image in your signature somewhere, when you wear a lapel pin down the street, or paint your first sunset grafitti on the side of the courthouse. (That option is void where prohibited by law, of course)

If you care to acknowledge your signature here in a comment feel free, but the pledge isn't about your name on a piece of paper, it's about your commitment to an ideal, and to exposing that ideal as widely as possible by the widespread dissimination of a innocuous image.