Yes, you can edit all the contributions at any time before the order is placed. We always do a proofing (read-through and spell/grammar check) after the order is placed and before we print, but if you catch errors before that, you’re welcome to fix them yourself :)
If contributors provide their email address when they submit, they’ll receive a copy of their contribution as well as a link to edit — so they can make changes as well.
Once the order has been placed, we’ll take care of any additional edits and will follow up in 2-5 business days with a PDF proof of the pages for you to approve before we start printing.