Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
Even though the UI of the website has not been updated yet, there has been some changes to how much you get for rating articles. This thread if just to share the info with others so that they are aware till the UI is updated.
Quoting the support team:
"Hey! We're sorry but our headquarters made a decision that from now on you can get only 1SG for one correctly verified article."
Screenshot:
https://i.imgur.com/FQjJ70b.png
I hope this helps other who were confused like me.