How can I add an individual new user?

To add a new individual user, click the "User" area and then click "Create new User" button in the top right hand side of the window. You should see this screen: 

Fill in the users details, and add them to any groups you would like them to be a part of, or to manage. 

You have the option to send the user a welcome email too - this will send immediately to the inbox. If you are not yet ready to send the invite, you can disable the welcome email option.

Instead, you can set a password for them and share it with them when the time is right.