There are two ways that you can buy extra credits on top of your existing membership plan: 

Top Up: If you don't have enough credits to book a specific class, this feature allows you to purchase the exact number of credits you need to book.

1. Click on the class you want to reserve
2. View purchase confirmation screen with the exact number of additional credits needed and associated cost
3. Confirm and complete purchase 

Add-On Credit Packs: This feature allows you to make a one-time credit pack purchase.

1. Go to your Account Settings
2. Click on "Add credits to your cycle"
3. See your options and purchase

Helpful tip: Credits are immediately added and don't change your cycle date. If you aren't able to use all your credits by the end of your cycle, up to 10 will roll over.