Once logged in, click on the Users icon on the left navigation pane to access the users' page.
From this page, click on the New User button on the top right.
When you create a new user, you have to assign a role to the user. You can do this by selecting the relevant option with the dropdown list located at the bottom of the screen:
You will need to set the password for the user - please choose a secure one (please find further information on secure passwords here). The safest way to issue login credentials to a new user is to ask them to get their own one automatically by using the forgotten password feature (accessible from the menu you use to login).
When all the information has been entered, click on the Save button on the top right.