Extendability

First of all nice plugin!

Second I would like to ask how extendable the free edition is with my own code. I would like to add some personal fields. However when I use a custom name and add ik to form-output.php it renders my Label but not my inputfield.

Can you shed some light on this?

Cheers!

https://ww.wp.xz.cn/plugins/visual-form-builder/