Please Note: The following screencast was created using Dynamik Website Builder, but is completely relevant to Genesis Extender since it shares this same feature.
Custom PHP Functions
What If I Do "Break" My Site?
If you've enabled the "Affect Admin" option and end up adding some code that temporarily "breaks" your site you can fix this by removing the bad code from your /wp-content/uploads/genesis-extender/plugin/custom-functions.php file, and then removing that same bad code from your Extender Custom > Custom Functions. Manually updating the custom-functions.php file gets you back into your WP Dashboard while updating your Custom Functions options helps prevent your site from re-breaking after saving your changes.