Account settings affect all projects under that account.
Account token - This is your private account token. It is used for registering new devices as well as for API calls. Don't share it and keep it secret.
2-factor authentication - Premium accounts can enable 2F authentication using an SMS code that's been sent to a phone number when logging-in to the dashboard.
Weekly status email - When enabled, you will receive an email on a weekly basis with a weekly summary of your devices and the main details of your account for that week.