JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
The available space in your account is to store files uploaded through your forms.
On regards of the sub-users, that is meant to allow you sharing your forms with someone else's JotForm Account. On free account, you can share your forms with up to 3 different accounts. You can grant different access to your forms, like viewing submission and/or editing forms:
Adding someone else's account does not mean this account will inherit same plan you have in your account.
If you need anything else please open a new thread, we will be glad to assist you.