allow others to edit form

I'm sorry. I'm not sure I understand your request here. 

When you say "others", did you mean to say "Sub-users"?

If that's the case you can check out this guide for your reference: 

How-to-Share-Forms-with-a-Sub-Account-User

You can have someone as your Sub-User through the Users section of your Account page.

You can set whether your Sub-users has capabilities to edit your form or not. 

If this is not what you mean, please feel free to get back to us with more details of your request and we will be glad to help you. Thank you.