Click on your name on the top right hand corner and select the Account Settings option from the dropdown menu. On the following page, you will see a page to manage your team. On the top right hand corner, there is the button. Clicking this button will open a window to enter in the employee’s name, email address, and role. Click here to read more on the differences in the Team Member and Administrator role.
The blue Invite button will send that person an email with a link to sign up. When they click the link, they will be able to review their personal information and create a password.