Can I customize the signup form?

Yes. When you create a signup, open Signup form on the needs step. Tick Ask for the student's name and class if you need it, and add up to three extra questions with an answer type of Text, Number, or Choices. On a signup you already made, use the Questions card on its page, pick Short answer, Choice, or Number, and click Save questions. Answers show next to each name and in the CSV.