Have you watched this video?
I would also recommend you install openhabian-config tool or start over and use the openhabian image as this will make setup much easier unless your knowledgeable about linux OS’s.
To add openhabian:
# install git
sudo apt-get update
sudo apt-get install git
# download and link
sudo git clone https://github.com/openhab/openhabian.git /opt/openhabian
sudo ln -s /opt/openhabian/openhabian-setup.sh /usr/local/bin/openhabian-config
# execute
sudo openhabian-config