Simply visit Administrative tools > Persons and click on the “Add a new person” button on the top right corner of the screen. Enter the persons details and save the profile. If you are on the monthly subscription, the system will automatically start billing for the new users in the next billing cycle. If you are on the yearly plan, the system will generate a pro-rated invoice for the additional users for the rest of the year, which you can pay from the Billing & receipts section.