Mautic ---> Thrive

I have installed the API in Thrive Themes for Mautic and it works great. But the one question I have is whether or not you can use more that just Name, Email and Phone in the form. I would like to use some custom fields that I have put in Mautic but can seem to figure out how to access them thru the ThriveTheme—>Mautic API. Is it possible?

Hi sgilleland, I can set up the API integration, but when I tried to link the lead form with Mautic, the combo box is empty. In mautic I created Segments & Forms.
I think I am missing a detail… but I dont have idea where to look