When you sign up, you are signing up to say you are generally available for that day. They do not have a list of shifts available yet. Thus, when you sign up, PLEASE include (in the comment area) what time(s) you would be available that day to help them out. If you don't put down a time, I'll assume you (a.) don't read this part [you'll be on my list!!!] and (b.) you're available that day for 24 hours straight to help them out! Thanks!