add HRT keys on MRV cam!

I had the keys for HRT plus channel, but I do not have an ID for this channel on my cam, so where sholud i put my keys?
this channel uses viaccess 2, but i do not have any emty slot there, where to put the keys on viaccess 2, yet is it possible to change the name of the groups where the keys apear?
and also does anyone know what keys should be used to open "prima fila" channels if this is possible?

HRT Croatia
V 00AC00 08
V 00AC00 09
V 00AC00 0A

you can send me any useful information at fotjondauti* also.