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You are right, these instructions for the Basecamp Classic. I have added the 'Classic' to the article title.
Unfortunately, I have not found any way to add the scripts/iFrames on the new Basecamp (Highrise CRM). You may contact their support to re-check if there is any way to embed the scripts/iFrames.
Please note that JotForm based forms can be integrated with the Highrise CRM:
If you need any further assistance please let us know.
Title: Adding Form to Basecamp Classic
"Looks like this uses Basecamp Classic."
You, Sir, have a very keen grasp of the obvious!