I'm sorry but in "Front A" panel what I have to put? I think nothing.
Thnaks
As markw mentioned, reading the manual is important if you are inexperienced.
If you are planning to use all 7 channels, plus the sub, the manual should show you the speaker setup menu. Someplace there you will select yes or no that the channel has a speaker connected.
Another part will have distance information to each speaker from the main listening position and whether the speaker is small( cannot do low frequencies well at all), or large if it can.
Then, in the end, you will find the a menu to level match all channels or may be called calibration. Need to perform this for a good setup; you will need an SPL meter or the built in mic if it has this as an auto setup. Important to read manual.