"add permission" to submit form

[Kathy Barton]

I created my first form with Forms for Confluence Cloud today and ran into a maddening problem. Everyone is getting an error saying "You must have add permission on the space to submit the form" when they try to submit the form, including me. I have full site and space admin permissions so I'm guessing this elusive "add permission" is somewhere else but for the life of me, I can't find it. Does anyone know where I need to set that? 

FYI I do have a support request in with Adaptavist but I'd really like to get this resolved ASAP. 

TIA! 

[Nic Brough -Adaptavist-]

My understanding (bear in mind I don't work in the Product team) is that your people who are hitting this problem do not have the Confluence Space Permission to create/edit pages.  The form gets saved as a page, so you need create/edit to save it.

[Kathy Barton]

Thanks Nic, but that's not the problem. Everyone who has hit this error is an active user (creating and editing).