i've downloaded the black fire 2 mod and the fy71 enabler for sp, i wanna use both, now i'm not very good at all this yet so i need to know how to make it so that the fy71 replaces the scarab without having to load it as a mod, i'm not sure where to go or what to do so any help would be appreciated.

I don't think you can combine mods.... but you could try asking around at CryMod.com