Add a User
Navigate to the Settings page by clicking "Settings" on the left hand dashboard.
Click on the "Manage Users" tab.
Add a user using the "Add User" button on the right.
Delete a User
Navigate to the Settings page by clicking "Settings" on the left hand dashboard.
Click on the "Manage Users" tab.
Find the user you want to delete, click the three dots on the right, and then "Delete User".