How do I add chrome cast to tv when hdmi 1 & 2 are already being used

This USB slot only supports Music (MP3) and Photo (JPG) multimedia files playback.
from user manual page 13

suggest getting a media player and plug into hdmi port
if other devices using the one hdmi then get a hdmi switch box.

https://www.electronicshub.org/best-usb-media-players/

or chrome cast device via a laptop/ wi fi to the tv via hdmi

what are you casting with? my wife uses her 12'' galaxy

tablet to cast Netflix shows.

chrome cast just plugs into hdmi no cables needed

Chrome cast needs to be setup using your phone app

You cant. It does not support any video out. The o ly thing you can do is cast the tablet to something like a roku, chrome cast, etc

I have found that when I am browsing on Netflix while Chrome cast is active I have to Disconnect the Chrome Cast and then Reconnect and after just a couple minutes of loading chosen item to stream....it pops up.
Good Luck

There are several options available.
If you have Chromecast , you can stream videos over your phone to the TV. The device is $35 USD. Plus you'll need to install the chrome cast app on your phone.

You can also use a Mobile Device USB Micro to HDMI Display MHL Adapter Cable. This also requires a regular HDMI cable.

Good Luck!

Try the hdmi settings in your tv, and select different modes, eg 720i 720p ect