Cardknox.com payment emulator with Authorize.net gateway

Hello, i would like to us the authorized.net Payment Option but i would like to use on of the emulators, where can i change the POST URL on the site? the gateway that i want to use is not listed on the drop-down,

The feature is already in our to do list. However, it is currently with low priority. We cannot provide you any ETA for this implementation at the moment. Once we have the feature ready to use, you'll be posted on the other thread with any update.

https://www.jotform.com/answers/573464

Thank you!