Looking for tutorial how to install biss keys

I m new to biss and feeds and i m looking for tutorial how to install biss keys.
I have tried so far the following:
constant.cw on /usr/keys/ folder and on oscam.server i have added the following:
[reader]
label = BISS
protocol = constcw
device = /usr/keys/constant.cw and /ect/tuxbox/configs/constant.cw
group = 1

And it didn't work.
Please advice.