http://bonyg5gd2cszplkckqffzfcefig5jldgwt36gm2jqdaezlgs3nrfhjid.onion/bible/content/bible/miscellaneous-information/openbazaar/installing_on_whonix/index.html
To open it simply open the Application Launcher which is the small “K” icon at the very bottom left (like the Start-Menu on windows) of your screen and type in “open” in the search bar. This should show you an entry called “OpenBazaar”, click on it. Now the OB window will open and prompt you with a question dialog after some loading.