Raspberry pi laser engraver

I am setting up my laser engraver with a raspberry pi cnc hat version 2.6 by Protoneer.
my question is how do I install laser web on the raspberry pi, I can follow the how to install on the website but was do I have to do to connect it? it looks for a USB port? thanks

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Just follow the installation instructions on https://laserweb.yurl.ch/documentation/installation/36-install-raspberry-pi and connect to USB and the correct serial port. The RX/TX lines of the 40 pin header should be listed there as one of the tty devices (usualy /dev/ttyAMA0).