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.
I'm not fully understanding your question? I believe you would like to have a check box, so the users can verify that he/she completed the form correctly. A possible solution would be to use the TERMS & CONDITION widget
In the widget wizard, you can enter the text you like in the LABEL and leave the link empty:
If you like, you may also add the following condition.
The condition will show the submit button when the check box is filled (checked), if not the button will be hidden.
Please let us know if this helps.