In order to setup Twitter authentication, you need to setup your own Twitter application at Twitter Developers portal.

Make sure that in field Callback URL is used the same value as in your BellaDati Configuration (field Application URL).

In case you have BellaDati installed on your localhost, set http://127.0.0.1:8080 as Callback URL.

Once this app is created, select tab Key and Access Tokens and copy values from fields Consumer Key (API key) & Consumer Secret (API Secret) into BellaDati configuration settings.

Twitter Key and Access Tokens