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.
Please refer to our user guide: How-to-Upgrade-My-Account
Or you can just use the Upgrade button in the JotForm Pricing page. Just make sure you are logged in to your account when upgrading.
May I inquire though why you would need to upgrade your current FREE subscription to paid subscription for only 5 days...
Perhaps you do not need to since the paid plans features are actually available also in FREE plan. The only difference between the plans are the allocations (i.e. number of submissions, storage space, upload space)
Hope this help. Let us know if you need further assistance.