How do I share a jot form so that someone else can own/manage it under their account?

I created a jot form for two different teachers. They both created a username. How can they use the form that I created?

You can add them as sub-account users of your account. More about sub account users and how to share the forms with them you can find inside of this guide:

How to Share Forms with a Sub-account User

However considering that you have free account, you can have only one sub account user.

We can also move forms you created to their accounts. However then you will not longer have access to those forms, unless they share the form with you, by adding your account as sub account of their account. 

If you want us to move your forms, please provide us usernames of accounts to which you want that forms are moved to. Also provide us ID's or names of the forms and tell us which form should be moved to which account. 

Hope this will help. Let us know if you need further assistance.