There are a couple different ways you can go to customize an existing theme:
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You can add a new theme component, and override the Fakebook theme’s CSS in that theme component. This is the recommended way for minor edits, as you’d still be able to get updates to the underlying theme. There are some guides here on Meta that should help:
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Alternatively, you can fork the Fakebook theme on Github and make edits to your own copy, and then install that.
- Github has some onboarding if you haven’t used it before: Getting started with your GitHub account - GitHub Docs
- Github’s fork documentation: Fork a repo - GitHub Docs