You can add multiple users to your account, depending on which plan you currently have.
Please note that only the Account Owner or Admin can invite users to the account.
To add a team member:
Click your Account name on the top-right corner of the page:
Go to Team Members, and click on the Invite User button.
Add the email address of your team member, and which role you'd like to assign then click Confirm.
The invited user will then receive an email invitation with instructions on how they can set their own password.