Kry0 posted a FAQ on the forums about what the streamers portal is, and how one can apply to be a part of it.
|The new Streamers Portal with some of the currently featured streamers!|
Anyone accepted into the Streamer Program will be placed into a specific tier according to their viewership, whether or not their stream contains coaching content, and of course whether they abide by the Summoner's Code. Depending on the tier you're placed in, you will receive incentives! This chart was published by Riot in regards to the incentive program.
|* means subject to change.|
|The five tiers of icons available to new streamers.|
The Streamer Portal is located here. This is where you can go to find streams you wish to watch.
Here is information about applying to become a featured streamer, along with information about benefits depending on what tier streamer you are.