It looks like you have not yet added a site to test. Click on the Add new site link in the left menu to add a new site to OAuch. Make sure you have your OAuth client details at hand (client ID, client secret, authorization URI, token URI, ...).
Alternatively, you can add a demo site to quickly try OAuch. In this case, OAuch will add a new demo site and set it up with the details of Duende IdentityServer's demo website (available at https://demo.duendesoftware.com/). When testing this OAuth implementation, you can use bob as both username and password to log in.
Once you have added one or more sites, this page will show an overview of the results of each site.