If I try logging in with my TSD forum credentials, it doesn’t accept that. If I try creating a new account, it says my email address is already in use. If I try submitting my order without creating an account, it still requires my email address, which it them states is already in use. I don’t know how to proceed here.
Yes, your email address is already in use. Try resetting your password through the shop. The forum and shop are not the same software, and your login info is not copied over from one to the other. If you require further help. Please contact me through the shop's contact form.