Hi, I am a noob like you but the first question will be is deCONZ running and can you access the APP.
So access your Pi with Putty (or other SSH client) and run the following commands to check this:
lsusb
ls -l /dev/ttyACM*
sudo systemctl status deconz-init.service
journalctl -xe
If you share then use ‘</>’ to make it more readable
Other questions could be did you change:
Important: enable_uart=1 should be set in /boot/config (RaspBee only)
Important: /boot/cmdline must not contain console=serial0 (RaspBee only)
With the following command you should start deCONZ and be able to use the APP
with http://IP-address:8081 (you may have used a different poort)