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.
All that you should do is open the Authorize.net payment tool wizard, by clicking on it and then on the little wand like icon shown in the quick action tools bar in the top right corner of it.
Once you do you will see the screen to add your API Login ID and Transaction Key. Just change them to new settings and click on Test Integration button and proceed to Finish.