If you have a specific channel/app, you are looking for, do a search in the Roku app store. Searching for terms, such as soccer, may not find what you are hoping to find as their search engine isn't always the greatest as sometimes it takes a specific way to search for something to find it, so it is helpful to know a specific channel name to search for. Also, depending on where you live, not all channels/apps are available.
How to add apps to your Roku streaming device | Official Roku Support
