Visit www.roblox.com and login to your ROBLOX account.
Select ROBUX from the top menu to buy ROBUX, or click ‘Upgrade Now’ in the left menu to buy a Builders Club subscription, then select Rixty as the form of payment.
If you HAVE NOT redeemed your Rixty PIN yet, enter it and click Redeem. Then click Submit Order, and you’re done.
If you HAVE already redeemed your PIN into a Rixty account, click the "Have a Rixty account?" link, and continue to Step 4.
Select your price point for ROBUX or Builders Club, and click ‘Buy Now’.
Login to the Rixty account into which you redeemed your Rixty PIN (you may need to click Logout first). Your Rixty account balance will appear.
Login to your Rixty account and complete the purchase. If you need to add funds, click a payment method and follow the prompts.