Please search the forums if you have a problem or question, as your answer will most likely be there.
For all other support enquiries please send an email to firstname.lastname@example.org. Please allow a few days, we get many emails and there is often a backlog. To make it easier for us to help you faster, please include your support ID in all enquiries, you can find it in-game in the "Support" section of Help/Credits in the pause menu. There is also a link to email us directly from there.