Once you have logged in successfully, click your username displayed on the top-right corner of the screen.

From the options revealed, click Billing. Doing so takes you to the Billing screen.

Here, your payment history is tabulated via Transaction ID, Amount, and Date columns.

Your current subscription plan is displayed in a panel on the right.

To change your subscription plan, click the button. This takes you to the Plans screen where you can upgrade your plan and select how you want to be billed (monthly or annually).

To upgrade your plan, click the button from the respective plan.

To create a custom plan, click the button.

To redeem a voucher, enter the redeem code in the Voucher field and click the button.