how to add biss keys to vu+ zero?

Hi I have a vu+ box and am trying to get some feeds on 7e and 10 w. One channel is amc africa Which is encrypted by a biss key can someone tell me how I add biss keys to a vu box. I have an open vix image installed. Can someone tell me, guide me and if possible provide some files that I would need to do this. I am using a ccam 2.3.0. Any help much appreciated thanks