By signing in to TuneIn you can access the and manage your personal content on your TuneIn account which will be associated by your Bang & Olufsen account. You can sign in to TuneIn by opening the Settings page and select the TuneIn page. This will allow you to enter your TuneIn username and password to sign in.
To login into TuneIn using Facebook or Google+ accounts you must create a password on the TuneIn website here: https://tunein.com/account/.
Under Account Settings->General, you will see the associated email address to your social login and a Change Your Password option.
Select Change Your Password - note that this will only change your password for TuneIn and not for your Facebook or Google account.
You can then use the associated email and password inside TuneIn in your Bang & Olufsen app.