When I try to buy RoR it asks me upon checkout for an email address and a password. I already have an account already. Is there a way in the store where I can login with the current account and buy things? Or do I create a new account?
How can I make sure that my purchase is added to my existing account and not a new one?
this is solved. In case someone has the same question: you get a code and enter it into your existing account.
And also for the benefit of anyone else, the account you are being asked to create is one with the vendor, Digital River. it is not in any way connected to your Turbine account.
When you get the code, login to your Turbine Account and apply it. Make sure you apply it to you existing subscription. A surprisingly large number of people seem to end up creating a new subscription, and thnat means having to contact Turbine Account Support to fix the problem.
The key to all this is "read the screns carefully" BEFORE you press the buttons! Don't get carried away by the excitement of the moment and hit buttons blindly.