Hello,
I’ll be happy to help you out with this!
Once you increase the number of attendees (to be greater than 0), a name and email address box should appear below the quantity input. Is nothing appearing when you increase the quantity?
If this is the case, can you try running through the instructions outlined here to check for any conflicts that might be occurring with your theme or another plugin? I would recommend doing this in a staging site – if you don’t have a staging site already, the free Duplicator or WP Staging plugins can help you get one set up. Please make sure to have WP_DEBUG enabled during testing and copy/paste any errors that you see into your reply.
Can you also send me a link to the page where this is happening and share your full system info with me?
Thanks,
Jennifer