plug in settings for non-profit organization other than Church

I read the following post regarding the use of the plug in for non-profit organization other than church:
https://www.ads-software.com/support/topic/can-the-plugin-be-used-for-non-church-non-profits/

But I do not have any clue on how to set up the plug in accordingly.

Can the register form be customize to add additional questions/delete irrelevant questions?

Could anyone help me.