I got it working! Huzzah! Thank you so much for your assistance! You've been a great help, and very prompt.
This form is for a role-playing site that's based on D&D, and I'm making a form for users to submit a log of them crafting something, and their success is based on a roll of a 100 sided die. If it is equal to or lower than their 'skill number', it is successful. Which is why I wanted it hidden until submission. If it was visibile BEFORE submission, people could cheat the system.