Thank you for your post!
You will be prompted to enter your registration code, or purchase instant access, when you go to log into your class section.
If the option to purchase is not listed, please provide a screen shot showing the options you see. Here's a guide on how to take a screen shot, if needed: http://goo.gl/WDqKg7
Once you take the screen shot, save it in Word or Paint and then attach the saved file here in a reply.
Please let me know if you have any questions. Have a great day!
How much is the access code if you buy it from the site itself?