Add seats by going into Account, shown at the bottom left on your screen, and then Manage Team.
Please note that when adding seats to a monthly subscription, the fee will be pro-rated and added to your next invoice when this is due. This allows you to maintain the same billing date throughout and plan your budget accurately.
If you would prefer not to delay payment, please contact NutriCalc® by using the contact form provided on this link, helpdesk@nutricalc.co.uk