Hello im new in Heroes 3 on gog. How i can play multiplayer with friends? When i click ,,online services'' the game was crashed,

If they're physically in the same room as you, use "Hot Seat".

If they aren't, you have these options:
- LAN: if you have a LAN emulator like Hamachi, Evolve, Tunngle or GameRanger, this is the option you will need to use.
- Direct TCP/IP connection: the host tells his friends his IP address, creates a room and his friends then enter that IP address to join him.

The easiest way to play online would be installing Horn of the Abyss expansion as well as the latest version of HD Mod, that way you'd be able to play online via HotA's online lobby (basically, instant connection to other players without any need to install third-party software like Hamachi or GameRanger to emulated local network, as well as easier search for other players).

It's also worth mentioning that both HotA and HD Mod add lots of essential features and content such as:
- High resolutions
- Hotkeys and general improvement of UI
- Simultaneous turns in multiplayer games
- Balance improvements and bug fixes
- A whole new faction
- New campaigns, new artifacts, new heroes, new map objects, new everything!
"...And much more!"

Both HotA and HD mod work perfectly with gog's version of Heroes 3, by the way.

If you aren't in the same room, and if everyone is willing to use the honor system, then you can play-by-email using the hotseat option.

Create a hotseat game, then each player takes their turn and emails the save to the next player before hitting the End Turn button. The next player in line hits "End Turn" for you (in case there are any Beginning-Of-Turn events) and takes their turn.

Player-Player combat can either be handled by Auto-combat (make sure everyone has the same options set for auto-combat) or by installing some remote access software on each player's computer. If you use the remote access option, then the person being attacked remotes into the current player's computer and they resolve the action in pseudo-hotseat style.

Of course, none of this really works unless everyone is using the honor system.