its on the web based interface, if you are running server from pc click advanced tab then advanced settings, a web page should open and then you have plugins in the tabs at top
or from max2play Open Squeezebox Server Webadministration then click settings on bottom right
Hi, on the server settings web page select the plugins tab then scroll down to Qobuz, tick the box and click apply, restart the server then go to advanced tab and Qobuz to input your account.