Click the Create User link in the Administration section.

The create a new user page looks like the image below.

First of all set the new users name and associated password.

The next step is to check the privileges that you want to grant this new user. When complete click the Save Changes button.

The new user will then be shown in the list of users (you are taken to this page upon clicking the Save Changes button in the previous step.

You can modify any user at any time by clicking the modify link next to the chosen user name.