Hi, Effie,
Welcome to the Forum! Yes, all you need to do to participate is enter your final score in the appropriate thread. As for people cheating, we operate on the honor system, but winners are expected to provide details of their strategy after a challenge is over. And even if you don't win, you might be asked in a private message to clarify something. It's a good idea not to erase your file until the challenge is over.
Hobos to Heroes wraps up today, but you still have 3 weeks left to work on Look What's in Store. Good luck!
MarianT