if it doesn’t appear in the browse tab, select manage and toggle it on.
Once you have entered your Qobuz credentials, be sure to select the three bar menu in the top corner of the Qobuz page, and from there choose settings/streaming to set the quality to hi res otherwise you’ll just get CD quality playback.
A Qobuz Connect option has been in development at Qobuz and when this arrives (it keeps getting delayed) you’ll then be able to use the Qobuz app just like you would Tidal.