Here you can add new user seats, manage your payment info, change your site plan and activate extra features directly from your site. Please note that you have to be an administrator of the site to do that.
Go to Settings > Administration > Plan, add-ons and billing to make changes.You can add users by clicking on the plus button. The updated invoice data is displayed automatically. Don't forget to save the changes. To reduce the number of seats, submit a request in the same view.
To manage the features you have active or wish to add to your current subscription, click on Manage add-ons.
You can also manage several entities within the same site. Read more about entities.To cancel your subscription, the site administrator would need to click on the Request to cancel button under the Payment information section, and follow the steps provided:
If your site administrator activates a new feature, it has to be activated in permission sets as well. Go to Settings > Administration > Permission sets to do that.