To log into TIDAL with a Squeezebox account, install TIDAL on your system.
Full installation instructions here: http://wiki.ickstream.com/index.php/Open_Beta_Squeezebox_Installation
For support or any questions about ickStream and the Squeezebox in particular, the forum is available at https://forum.ickstream.com or send a mail to: firstname.lastname@example.org
If you have any playback trouble, login to https://cloud.ickstream.com. In the Services section remove TIDAL from their account, then add TIDAL to the account.