Warning: Optional features are subject to change.
Activating optional features for GitHub Apps
-  Navigate to your account settings. - For a GitHub App owned by a personal account, in the upper-right corner of any page, click your profile photo, then click Settings.
- For a GitHub App owned by an organization, in the upper-right corner of any page, click your profile photo, then click Your organizations. Then, to the right of the organization, click Settings.
 
-  In the left sidebar, click Developer settings. 
-  Click Edit next to the GitHub App you want to enable an optional feature for. 
-  In the settings sidebar, click Optional features. 
-  Next to the optional feature you want to enable for your app, click Opt-in.