Click on the black gear icon on the top right corner
Select "Company settings" in the dropdown menu
In the left sub menu select "Users"
Click on the green button to Invite Users
Fill out all user information and then click the green button "Invite User" at the bottom of the pop up window. You can manage user permissions by selecting either Admin or Standard User. Note: Standard users are allowed to access only the selected accounts (in this example Account 1, Account 2).