When you're sure that the server has started, head your browser to http://localhost:7080/webclient/. There, you may log in as 'alice', her password is 'alice'.
You will be presented with the workitem stores that the user alice has access to. As packaged, alice only has access to the 'alpha' store.
OpenWFE 1.7.1 provides a new 'gwebclient' : it's early 'alpha' stuff available at http://localhost:7080/webclient/ in parallel to the old webclient. This is currently only meant for developers and contributors.