Its main goals are to:
FormZ is a standalone extension, that does not need the core extension to work, nor will extend the core extension functionality.
Developper abilities – as well as some integrator skills – are mandatory to use FormZ in a TYPO3 extension.
There is probably some configuration error for you form. FormZ can't work with invalid configuration and will cancel any rendering.
To get information about the error(s), you may enable the debug mode (see official documentation).