How do I loop out of Zgemma to another reciever

[Riponair]

Hi.
I am wanting to loop out to another receiver but I cant make zgemma do it.
I am using tuner "A" as my main feed in and works ok, I connect other cable to tuner "B" loop out but nothing happens.
help please.

many thanks

[Dave5118]

Going off the pictures from Goldwafers shop, only tuner B has a loopthrough.

[Riponair]

ok I will give that a go,

many thanks