I can’t seem to be able to change the IP address for DHCP to Static.
So I tried to do it at the setup of a new install, but each time the installer crashed.
Not being too familiar with Linux and even less with CentOS, I kept it like that for now, but I hate being bullied be something I don’t know.
Please if someone could help with a little teaching… 
@Baguaman Hello again,
Currently Rockstor doesn’t support configuration of wifi interfaces, only wired ethernet. But you may be able to configure this device via nmcli (Network Manager Command Line Interface) and given Rockstor itself uses nmcli in the background, then hopefully any changes you make will not break any other existing network connections.
Hope that helps.