Can I share a form to be edited by someone else?

Can I share a form to be edited by someone else on a free plan?

Yes. It is possible to make other users holding any plan to be your sub-account user and share a form to edit. Please refer to the guide below that provides with more information on sharing forms with another user.

https://www.jotform.com/help/232-How-to-share-forms-with-a-sub-account-user

Hope this information helps!