Log in to your Ikariam account and enter the game. On the top left side of the screen, you'll find a "Shop" button. Click on it.
Click on "Top up Premium Currency!".
Choose the pack of Ambrosia which corresponds to the amount from the reward you've selected on Gamehag.
Select paysafecard as the payment method and click on "Buy now".
After an other window appears, enter the code you've received from us. After reading the Terms of paysafecard, click on the "Pay" button.