Navigate to Setup, under Administration in Altitude Cloud, then Account.

Ensure you are on the Users tab and select Add User
​

Specify all user information as required, then establish a role for the user.

Indicate whether you would like the new user to receive an email notification of new login and select create.
​

The user will then be prompted to update their password upon their first login to the platform.

Ensure you select the Properties you want the user to have access to in the Properties selector.