In your home screen scroll down until you see Share Access, selecting this will take you to the Organisation Members screen.
Select 'Add Member' and enter their email address. Add their name and mobile number, or they can choose to add their personal settings when they accept your invitation.
Choose their role, member or admin, and then select Invite Member. They will receive an email with a Waterwatch invitation to your organisation and will be prompted to enter a new password in Waterwatch Live.
You can also access the Organisation Members screen by selecting the Account icon (home screen, bottom right) and then Members > Manage. Select the + icon at the top right of Organisation Members Screen.