How to contribute to someone else's repository?

Question

I have a friend who has a repository in his GitHub account. I want to contribute (pull/push) to the master branch (the only branch) on that repo directly.

How would

Answer 1

I'm summing up everyone's answer.

1. Fork your friend's repository.
2. Fire up your terminal and type git clone {URL}.
3. Use this command to create a branch: git checkout -b new_branch.
4. Create a new remote for the upstream repo i.e. the link of original repo with the command: git remote add upstream {URL}
5. Do whatever changes you want in your local machine.
6. Fire up your terminal again and type git add {file name} or git add . if you want to add all files.
7. Then type a message git commit -m "message"
8. Create a branch: git remote add upstream {URL of friend's repository that you have forked}
9. For confirmation: git remote -v
10. git push Here you have to give your username and password.