no buttons seems to be disabled

it seems to be no limitations in nb of keys ????

to change key, type 8282 then you have the screen with keys
you choose encryption type with color keys
red=seca green=irdeto yellow=via blue=nagra

to add a key you click on "1"

to delete "2"

to modify you go to the key you want to change with the directional arrow than you clic on "OK".
you have new little window with 3 cases :
1° for provider code (0003 for C+France, 07C00 for TPS, 1702 for ORF for ex)
2° for key index (0C, 0D....)
3° for key (in this format "1A DF E2 A8 45 98 3E 68")
to do that you have in this window nb from 0 to 9 and letter from A to F