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.
Epic Games need release fortnite for the rest of the non Samsung's phone. I personally have Samsung J7 Prime but I cant play fortnite yet which is dumb also on the other note when Save the World is coming Summer is over and it's soon Christmas and Epic Games said its going to be free summer 2018.