Sorry, I'm not going to be able to help you. I don't have any experience with S3Bubble. I'd also caution you against getting locked into any form of subscription service for your channel. Especially one that does not provide enough help to guide you through creating your channel. There are other available options to developing a channel. If you're interested, have a look at the software I provide in my signature at the bottom.
Again, sorry I could not be of help...
Windows desktop software for creating BIF
(Trick Play), Direct Publisher
(MRSS, JSON), and FireTV
feeds @ GitHub/rrirower
. No programming knowledge required