how do i mount disk brakes onto a kona muni mula frame

How old is it, does it have disc mounts?

are you talking about an older model with IS mounts something like this

to a post mount disc brake, in which case you will need an adaptor something like this

if you ring hope and explain what size disc and what brake you have they should be able to tell you what adaptor you need

If it doesn't have the two eyes/holes like in Kimber's top picture then you need an adapter. there're 2 that I know of, one made by a2z and the other by braketherapy. Braketherapy one is supposed to be excellent but very expensive (probably more than most disc brakes themselves). a2z is cheaper and would probably work fine.

No mounts on a Muni Mula as far as I remember, but pretty sure they had fairly large flat dropouts so could be used with an A2Z adapter. There's another thread with pics going on at the moment if you want to check one out.

2000 muni mula had disc mounts for sure (gold one)
and later models green? will have too

thanks guys been outbid on them now anyway lol