Go to the Multiplayer tab and make sure that Visible to LAN Players is enabled; Start the game. To join a LAN session: Click Play on the Minecraft title screen.
This is a guide to help players get started in Tekkit Classic, using the IndustrialCraft2 mod. Players who need help to do Vanilla processes should go to this.
1. open Minecraft on you preferred client 2. once in Minecraft, click on the multiplayer button 3. click "add server" 4. in the section where the IP goes.