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.
They keep rejecting the quest that I did! I created a new account and verified my account. I took the steps as what they wanted me to do and they still rejected the proof that I provided for them.