@PhyllisC904 ,
The custom code editor has always been available in accounts, and requires that you have enough HTML coding knowledge to fully build your email from your own HTML code. You can access it by creating a new email, and selecting the option for custom code. Our Tier 2 support team can assist with troubleshooting in the custom code editor if you call in, but they cannot write your email's code for you.
If you're not seeing the undo button at the top of the regular email editor, you're either not scrolled up enough (i.e. you also can't see the save or continue buttons), or there's something on your device or browser that's blocking elements of the editor from showing. For the latter, I'd recommend connectivity troubleshooting to narrow down and address the source of the issue.
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