Can someone give me the link to go from 4.3.1 to 4.4?? topic

I'm running Dirty Unicorn 4.3.1 and MK4 and want to root to 4.4 kit kat and load some new roms.
I have tried just wiping and flashing, but I get no data unless i'm on wifi.
Is there a step by step to get the update?? I also read about some knox crap also. Don't know what that is.
Please advise.......
Thanks in advance
Dave