Find the latest gift post in the official game community. They are published two times every day: at 1.30 PM and 6.30 PM UTC. Click on the link the post provides.
Your game will launch and automatically give you the gift. Upon receiving the gift you will see a pop-up window in the game; please note that amount of resources in the gift depends on your rank.
Click 'Collect reward' button or anywhere in the game window — your resources will be automatically added to your reserves.
Links in the gift posts work for 24 hours after being published, make sure to take your gift before it expires!