Help to new openhab user

hi

i have en raspberry 3 and razberry z-wave controller card but i can´t find my z-wave item in the Z-Wave Serial Controller item setup it ask for seriel port where du i find this

pleas help i am new in openhab 2.0

regarding to:
http://www.homeautomationforgeeks.com/openhab_zwave.shtml#zwave

it might be:

/dev/ttyAMA0

Easiest way to find it is to plug it in and run ls /dev/tty*. Then unplug it and run that command again. The Item that disappeared is the serial port for the controller.

i have tryed this things but i still get this Status: OFFLINE - COMMUNICATION_ERROR Serial Error: Port /dev/ttyAMA0 does not exist

Have you used the following command?

sudo usermod -a -G dialout openhab