Note: you must be on Sendspark Pro or a higher plan to use Video CTAs.
Follow these steps to add a "Call Me" button to your videos
Toggle on the Call-to-Action field
Write your desired button text (ex: Call Me)
Write tel: and your phone number where it says URL (ex: tel:1234567890)
You'll be able to check that everything looks good in the preview area on the right of your page 👍