How to play Heroes of Might and Magic III online via Hamachi?

how is your friend connected to the internet?
if I understand correctly, the error message in English says that his adapter is manually configured with a different IP address that he doesn't like. Check the adapter settings; it should be set to obtain an IP address automatically.

here's the problem: when connecting in Hamachi, it shows an error.

when connecting what to what?
when Hamachi is turned on, or when connecting to a room?