Initial Setup

Eclipse

Create a new account.
Give your username to the repository owner and have them add you as a collaborator

Select Git Repository Exploring
ignore the warnings
Select Clone a Git repository to start the wizard
Enter the URI of the repository under Location, found in your github.com account
Enter your github.com User and Password under Authentication
Hit Next twice
Under Destination >> Directory, select the folder where you want your local files to be stored
Check Import all existing projects after clone finishes under Projects
Hit Finish