Affected software version: 1.1.26 and up
To add a user, log in as Admin and go to the Admin menu in the bottom left corner:
Once in the Admin menu, click on User Management:
Here you can create a new user or change the existing one.
Click on the Add button and an additional menu for the creation of the new user will appear. Fill in the required fields, assign the user with at least one role, add the newly created user to a group or associate him/her with an existing mail if needed.
Don't forget to click on the Save button to apply the changes and use the Refresh tab so the system can display the changes you've made. This will make the new user visible.