Hello Kimberley!
Thanks for your question.
Kindly be informed that you can edit the HTML source code of the page, so you should be able to add a Candu script tag.
Also, you can add new content blocks to Suitedash, however you cannot edit the existing UI (e.g., you can add a button, but not change a button that is already on the page).
Hope this helps.
If you have any further questions, we will be happy to help!