How to push to fork ?

I downloaded opensource project to local machine and fixed one issue, now i want to puhs it to Git. So i forked that repo and started fork. But i don’t know what to do next?  
I would appreciate step-by-step answer like : first use

git init

on local machine and so on.

In order to push to any repository, whether it is a fork or not, you have to configure a “remote” that points to that repository. You can find instructions for how to add a remote to a GitHub repository in our help documentation. Once the remote is configured, you can push your changes to the remote repository.

I hope that helps! Let us know if you have more questions.