What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If you're referring to Subusers you added to your account, Treasurer200club, then they would use their respective JotForm account credentials.
I checked your account and found 3 users added:
firstname.lastname@example.org (Free Plan)
email@example.com (Free Plan)
firstname.lastname@example.org (No Account)
The first 2 above would just need login normally to their respective free accounts and a folder would be visible on the left hand side of their MY FORMS page (https://jotform.com/myforms/) where they would see the forms you shared with them.
(This image above is from email@example.com's perspective when he's logged in to his account)
On the other hand, the 3rd subuser above would need to create an account using that same email firstname.lastname@example.org in order to access the forms you shared with him. Just ask him to setup one on this page https://jotform.com/signup/ and ensure that he will use that same email.
Related guide: How-to-share-forms-with-a-sub-account-user