1. Open the terminal application while logged in as an Administrator. 2. Type "sudo scutil --set ComputerName "INSERTNAME", minus the quotes and press enter. If it asks for a password type in your Administrator password. 3. Type "sudo scutil --set HostName "INSERTNAME", minus the quotes and press enter. 4. Type "sudo scutil --set LocalHostName "INSERTNAME", minus the quotes and press enter.