It was a little hard for me going through google to find a code that was specifically for the UNO with a 2.8" TFT LCD screen sitting on top of it, so I thought this might help another newbie out.
Items you'll need:
1. Arduino Uno R3
2. Elegoo UNO R3 2.8" TFT touch screen
3. Arduino IDE installed on your pc
Step 1: Connection
Connect your UNO to your pc via usb, and go to http://www.elegoo.com/download/
When you click on the Elegoo TFT LCD screen it will download a zip file. Extract it to your Arduino libraries folder.
Then go to C:\Users\XXXXX\Documents\Arduino\libraries\2.8inch_Arduino_ILI9341\Arduino Demo_UNO&Mega2560\Example04-Touch\tftpaint and open up the tftpaint.ino
Step 2: Connecting the Screen
Simply place the screen on top of your UNO (SD card slot should face the UNO usb port). Make sure to press it into place.
Then just upload your sketch to your UNO!
Fyi: If you want to disconnect your UNO from your pc you'll need to connect it to an external power source.
*All product names, logos, and brands are property of their respective owners. All company, product and service names used in this instructable are for identification purposes only. Use of these names, logos, and brands does not imply endorsement.