Hi David,
It's not entirely intuitive at first. Once you get into the Tidal application via the Naim app on the iPad,
then you should select the Tidal Icon at the top right hand of the page. This should give you the options:
"Play current queue"
"What's new"
"TIDAL Rising"
"TIDAL Discovery"
"Playlists"
"Genres"
"My music"
The "My Music" selection won't have anything there until you create a playlist of save some albums or tracks.
I suggest you start by selecting "Genres", and take it from there.
You can also search for albums, artists etc by choosing the search icon on the right of the screen (just under the Tidal icon.
Hope this helps.