The mySmartControl app account is used to register the app under an email address. When you want to log in to the mySmartControl app on another device, you no longer need to pair it through the mySmartControl portal; you only need to log in with the mySmartControl app account. Once logged in, the data will be transferred to the new device.
The account for the mySmartControl portal (www.portal.mysmartcontrol.com) is created by an administrator. The administrator of the mySmartControl portal can link systems, manage locations, users, and any subscriptions.