When someone signs up for a slot I want to add comment section so they can leave a note. Like a few mins late or brining someone else as well. Is that something that can be added?
Yes, it sounds like what you want to do is add a Custom Sign-up Field. With Sign-up Sheets Pro, in your WordPress admin, go to… Sign-up Sheets > Setting > Sign-up Form, and then create a new Custom Sign-up Field with the type “text” or “textarea”. This will add a new field on the sign-up form that your users can fill out when they submit their sign-up. Learn more about custom sign-up fields.