You can upgrade right from the Always-On Sidebar. If your Sidebar is hidden, click the tail on the right side of the your Gmail window or click the ContactMonkey tab in the Outlook menu bar, then click Show Sidebar.
Right near the top of the sidebar, click “Manage Your Subscription”. This is where you can choose to upgrade to Salesforce Edition. Then enter in your credit card details. We accept Visa, Mastercard, American Express and Discover. If you have any other questions please email firstname.lastname@example.org.