Annotating your check-in with Github Pull Requests
After following the steps outlined here, select to connect beside Github.
You will then be redirected to the below page. Enter your corresponding login information and select Sign in.
Once all steps required to connect to Github has been connected, you will return to the webpage showing all the different project management tools. As show below, under Github, it will show that you have now been connected, indicated by the green dot on the right side. You may choose to disconnect from Github at any time by selecting disconnect.
When you go to complete your check-in, on the right hand side under Tasks & Activity, Github will now be listed. Click show and select the pull requests in the repositories you wish to reference in your check-in response, as shown below: