To start, log in to your Luxor account and navigate to "Home" and then to "Revenue." Click on "Download CSV" on the "Transactions" section.
To import your Luxor revenue CSV to BitcoinTaxes, first, log in to your account and navigate to the "Income" section on the homepage. (And if you haven't sign up, make sure to use our referral link for 10% off their services!).
From here, you should see the "Import Income" column with BitcoinTaxes partners, and you will find Luxor in the middle of the pack (the list is alphabetized) and can upload your CSV here.