Warning: Optional features are subject to change.
Activating optional features for GitHub Apps
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In the upper-right corner of any page, click your profile photo, then click Settings.

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In the left sidebar, click Developer settings.

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Select the GitHub App you want to enable an optional feature for.
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In the left sidebar, click Optional Features.
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Next to the optional feature you want to enable for your app, click Opt-in.

 
Activating optional features for OAuth Apps
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In the upper-right corner of any page, click your profile photo, then click Settings.

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In the left sidebar, click Developer settings.

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In the left sidebar, click OAuth Apps.

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In the left sidebar, click Optional Features.
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Next to the optional feature you want to enable for your app, click Opt-in.
