Log into your Jira instance as an admin.
Click the admin dropdown and choose Add-ons.The Find new apps or Find new add-ons screen loads.
Click Install to download and install your app.
You're all set! Click Close in the Installed and ready to go dialog.
Go to the configuration page by click on Configuration.
2. Connect to GitHub.com.
3. Sign in to GitHub in an opened popup.
4. Authorize access to your repositories and organizations.
5. Select repositories related to your projects.