From the navigation bar at the top of your admin dashboard, click your user name. A dropdown menu will appear; select Payment / Billing.
At the bottom of the column for your desired plan, click Select.
We only accept payment via Visa and MasterCard at this time. Please contact firstname.lastname@example.org if you have a credit card issued by some other company.
You can begin using your new plan as soon as we have finished authorizing your card.