Look at the U2717D User's Guide, Page 9, #6 = Audio line-out port
That is where you plug in external speakers. As to how to setup the Amazon Firestick audio, no idea. You would have to ask them.
Thank you Chris for the quick response.
I am sorry I have mentioned wrong product Id. However, I have Dell SE2416H 24-inch, which doesn't have USB port, it just have VGA and HDMI.
Thank you once again!
Unfortunately, the SE2416H does not have any way to communicate with audio. This would not be a good choice for the Amazon Firestick which requires a monitor that either has internal speakers or an audio out jack for speakers.