Alright, so I just figured out where to enter the IL Pin. It's weird that IL is asking for it because normally you only need an AGI to verify yourself. But here's what you do:
Start Step 3 in the File section. On the prompt that asks you for your AGI, select the bottom option that says verify your signature in a different way. After selecting that option you'll get the option to enter your IL Pin number.
Hope this helps everyone! Be safe out there.
