If you are currently on the Space Station plan and want to upgrade to Luna, go to your Outpost Control Center. You should see an option under Useful Links on your homepage, or you can go to Integrations under Account to find an upgrade link:
Image Credits: "30 Doradus B" X-ray: NASA/CXC/Penn State Univ./L. Townsley et al.; Optical: NASA/STScI/HST; Infrared: NASA/JPL/CalTech/SST; Image Processing: NASA/CXC/SAO/J. Schmidt, N. Wolk, K. Arcand
Go to the main documentation page. Or contact support@outpost.pub if you have questions.