Using this coupon as an example (may have an expiration date): KNIGHTSOFVEDA
1 Go to the input page: https://astra.hybeim.com/en/coupon
2 Enter your account code. (Located in the game menu, settings, account)
3 Enter coupon
4 Click “Registration Coupon”
5 We go to the mail inside the game and click to collect the reward (perhaps the period for receiving may be limited)