All Account Owners and Admins have the ability to invite a new User to their account.
Here are the steps:
- Go to the People tab
- Click on the *Invite New Person* button
- Enter their full name, email address in the blank fields
- Choose their Role (Administrator or Member)
- Click on *Send an Invitation* button
PS: If you are the Account Owner and you max out of the number of users you can have on your account, you will see an alert to "Upgrade" your account.