GitHub is a git hosting service. A vast majority of the modern open source projects use GitHub to host their code. GitHub has many features that cater to open-source projects.
To participate in open-source projects on GitHub, you need to create an account. To create an account, just pick a username, an email address and a password, and then click Sign up for GitHub, then choose the plan that's right for you.
We'll hit the finish Sign up button here. It looks like GitHub is wise to the fact that I'm a copy account, but it did actually send me an email. I can go ahead and verify my email address there. Our email is verified.
Now, we have a GitHub account. We can start browsing GitHub. The specific repository that we're interested in is found at eggheadio-github/stack-overflow-copy-paste. This is the repository that we're going to be contributing to you for this project.