I am new and need help badly

I got my kodi from my brother and I didn’t know there were different types of kodi like firestick and something idk

i have heard that it got messed up because they changed the tfc,tv > beta.tfc.tv or something and i saw some links that would be able to fix my TFC

and just to clarify my TFC add on is the only one not working everything else is fine

I just need a guide step by step on how to put that file in my kodi and where I really need help im a newb

TFC is mainly for my grandpa so he can watch his shows and he’s been bored and got nothing to do without it so please help me

I will pay someone just to guide me step by step on skype: elehayym1110