Thank you your answer,
I waited but still I couldnt see so I tried sudo iwlist scan command and I got this error:
lo Interface doesn't support scanning
eth0 Interface doesn't support scanning
Also when I run systemctl status hostapd I got this error:
systemctl : command not found
I am new to all this so I need to ask is there something missing ?
I use HDMI , keyboard and I power up the ErleBrain3 after these connections should I see the erle@erle-brain-3 like here : http://docs.erlerobotics.com/brains/erle-brain-3/getting_started/peripherals
Maybe missing something about flashing SD card ?