Firstly you have to register here: https://hacktoberfest.digitalocean.com/
Follow these steps to make your first pull request-

1. Fork this repository.
2. Clone your forked repository to your local machine.
3. Add your name in Contributors.md file.
4. Write these command on your terminal-

git add -A
git commit -m "your name"
git push origin master

5. Then create your pull request.
6. Star my repository.
7. Congratulations!! You have successfully created your first pull request.
8. Check your progress here (https://hacktoberfest.digitalocean.com/profile)
9. Wait for your t-shirt
10. Follow me on Github (https://github.com/HrithikMittal)

Regards, Adhikansh Mittal

(Click on the image below)