If you are the account owner or have the required permissions then you can add new people to the account. See the permissions page about adding permissions and giving access.
- Click on your name on the top right corner.
- From the drop down choose "Invite and manage people".
- Click on the "Add people" button.
- Fill in the email addresses and select the projects you want to give access to.
- Click on the "Send invitation" button.
Every user will get an email with an invitation to sign up to Breeze.