Custom themes are not supported by Zendesk and are not automatically updated when new features are released. See The difference between standard and custom themes.
- In Guide, click the Customize design icon () in the sidebar.
- Click the theme you want to edit to open it.
Click Edit Code.
The file opens in the code editor.
Click Save in the top right to save your changes.
The changes are applied to your theme.
To preview your changes, click Preview (see Previewing your theme in Help Center).
- Make other code changes as needed, then click Save.
When you’re finished, you can close the file.