The main features of Mail Archiver X Pro are the same as the normal version. The big difference is in the Setup.
Go to the Setup and then to Server. Enter the value for the IP address of the server, it's port, the database name, user name and password. Click on the Connect button to connect to the server. There is an error message if the connection is not possible.
When starting Mail Archiver the next time it should connect automatically to this archive.
If you don't know the correct IP address then open System Preferences -> Network on the computer that has Valentina Server installed. You should see the IP address on the right side. Here the main computer has an IP address of 192.168.2.101 (no trailing period).