If you're using the Windows Operating System, you can use the [RSS Feeds Creator](https://github.com/RiiConnect24/rssmii/releases/download/v1.4.1/RSSFeedsCreator.bat) program created by KcrPL. It will automatically create a `feeds.xml` file and will copy it to your SD card!
Replace the "name" portion with the title you want to put for the feed. Make sure it's not very long, since there's not that much space. Then, replace the link portion with the link to the RSS feed. You can put as many feeds as you want. Don't delete the "CDATA" part.
Not getting any feed updates? Try an RSS feed that updates more frequently, like a feed with news for example. If the RSS feed doesn't update often, then you won't get many updates.
If you're not receiving updates after a few days, you might need to subscribe to the RSS feeds again. Launch RSSMii from the Homebrew Channel again and it'll create brand new subscriptions.