Step 1 - Go to the "Mail" section and click "Set auto responder" icon.
(see screenshot)

Step 2 - Choose the user to which you want the auto responder assigned to, then enter the message subject in the "Subject" field, enter the message body and click "Create" button.
(see screenshot)


Please make sure that you are viewing the screenshots in their
original sizes as there is possibility that your browser is resizing
the images!!!

If you have more question regards this matter, please contact our
support team