Type on the grey rear wheel at the top left of the screen in order to reach the app settings, and then click on 'Log in / Register'.
The login via Google+ and Facebook is currently not available. Please create a user account using the radio.net icon.
If you have previously used Google or Facebook to log in, please send an e-mail at firstname.lastname@example.org or use the contact form - "Answer not found? Ask a question here" - below this article.