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.
You won't be able to add another admin to your account, you will be the sole admin. What you can do is add subusers.
You may allow your subusers to either View Submissions or Edit Forms. Here's a quick guide on How-to-share-forms-with-a-sub-account-user
The only way to allow others to have admin rights is to share your admin credentials with them (which I won't recommend unless you really need someone to have full access). This in turn will give them access to your account, add new subusers, create/delete forms, etc. Basically, anything you can do now can be done by them.