From GEWar Manual
If you enjoy playing GEWar you may donate in order to help the game owner Luke with paying the server costs. GEWar is a hobby project and Luke is not intending to make any profit with this.
If you donate, you will have certain advantages in this game, please read here:
How to donate
In order to donate, please go to the forums, click "User CP" in the top left corner. Look at the links on the left panel of the page and choose "Paid Suscriptions" under "Miscellaneous". Here is a direct link:
Right now this page allows only payment by paypal. If you cannot use paypal, please send Luke a private message or post in the support forum.