The application has two modes of source streams, the first if you have urls you can enter and play it, the second is that the application suggests a list of live TV streams and videos. In both modes you can store the streams by giving them a custom name or by default in a database to be used later.
The list of suggested streams is modified periodically in order to suggest a better and wider content. In addition notifications are sent to users when new streams are added or there is an important event Live Soccer, Live Box, Live Baseball, News, etc).
To obtain m3u8 streams and other formats, you can download m3u lists from the internet and then open them with a text editor, there you will find the url of the streams contained in the list. Copies the one that interests you, you paste it and reproduce it, if it works you can give it a name and save it in your playlist. Some list providers are Exabyte TV, tecnowillblog, android-latino, etc. There are many pages and videos on YouTube that provide these lists month after month.