I am currently using minecraft 1.12.2 and this mod is unable to do what is was designed to do. The "config" button is unclickable and i can't "edit it manually". Now this wouldn't be so much of a problem if i could search up the answers on the internet but guess what, no results! Anyways if someone could give me HELPFUL/USEFUL advice, that would be very much appreciated.

There is no GUI to edit the config, you will have to edit it manually. The file is in the /config folder of wherever your Minecraft is installed.