While you are logged in as an Administrator (see "Understanding User Roles"), click on your user name in the top right corner of the page to open a dropdown menu.
Select Site Setup from the dropdown menu to open the Site Setup screen.
Select Users from the Plone Configuration category to open the Users Overview.
Click Add New User. This will open a dialog.
Add the user’s full name, username, password, email, and any Groups the user should belong to. Note: this is configurable based on the “Settings” tab of the Users and Groups page. These instructions represent the default available fields.
If you are an administrator setting up an account for another user, check the “Send a confirmation mail with a link to set the password” box to allow them to set their own password on their first login.