To setup your billing, hover over the settings icon in the bottom left of your screen, and click on Billing.
(Or, just click here)
If you don’t know yet which plan is best for you, click here to get more info.
If you know which plan is right for you, hit ‘Setup Billing’ under your desired plan and you’ll be able to put in your payment details and you're good to go!
Having issues setting up billing?
Check out common causes here.