I Need some help

Hello guys, my name is Mark. I'm very new to using a nextion screen.

The problem: I have created my own pages in the Nextion editor and want to upload it to my screen. When I Try and upload it I keep getting a connection timeout. 

Is there somebody who can help me out?

(Btw, I'm building a flag indicator for iRacing to display the current flags across the circuit. [Green, Yellow, Blue, White, Black, Meatball and Chequered]). 

Kind regards,

Mark