Click on the Upgrade button in the top right of your screen

Choose your subscription cycle (monthly or annual) and your subscription tier (Standard or Professional)
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Enter your Billing Organisation, Billing Address and add any additional billing contacts.

On the right of your screen you will be shown you subscription purchase

Once you are happy with all of the information click on Next located in the bottom right of the screen

If you do not currently have a payment method on your account you will be required to add one by clicking on Add payment method.

Once your payment method has been added you can continue with your purchase by clicking on Next.

Accept the confirmations and click on Upgrade

You will have now upgraded to a paid subscription.