While SSH is enabled by default on ArdexaLinux, it is blocked by the firewall to any external address. This means that you can access the SSH port using the Ardexa TUNNEL feature, but not from the local network.
To access SSH via the local network, you must open the firewall to allow access.
!! WARNING: You MUST change the password BEFORE you open SSH access to the local network !!
Not changing the password is a major security risk.
Once the password has been changed, you can open the firewall by running
ufw allow ssh