When using an iPad, we recommend opening your spreadsheet with the browser instead of the gSheets app on your iPad. Here’s more on that from the Tiller Money Community.
Google add-ons (like the Tiller Money Feeds add-on that powers your feeds) are not currently supported in the gSheets app. That’s why using the browser is a good workaround.
However, I’d still recommend completing the setup of your spreadsheet from a computer if possible-- that will definitely be the most streamlined experience.