Open terminal and log on as the user created in the install:

su - [frappe-user]

Enter the password then:

cd ~/frappe-bench
bench start

You will see a bunch of text in the terminal - look for the following text.

Running on http://0.0.0.0:8000/

Right click and open link. This will open your project in your browser.
Log in and you will be at the desk (backend) of your project - to see the website go to the top right of the screen you will see "settings" - click on this then "view website"

To quit go back to the terminal and Ctrl+C