Thank you for reaching out to the Community! The good news is you can insert your own HTML in a Custom Code Campaign. You can access this Custom Code Editor through the Create button under your Campaigns tab.
Once you click Create, you will get a pop-up where you must select Email.
This will then bring you to our template selector where you can choose Custom Code.
Please let us know if there is anything else we can assist with in your account. We're always happy to help point you in the right direction.
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