How does it work?

Hi,
I can not understand how to configure the firewall.
How to handle some applications.
For some months, some applications are blocked by the Firewall in some days, and sometimes not, then some part of the same application seems to work and other parts do not work.
Then where do I block or unlock the programs?
How else is there any way to open a ticket in Italian?

support and FAQ https://support.avast.com/en-us

https://support.avast.com/en-us/article/Antivirus-Firewall-Application-Rules