aac installed (i think) but doesnt work ?

I have installed the free 2.4.6 um, looks great, but I only have music on I tunes, so I downloaded the aac plug in thing and it goes through and the progress bar says “finished” so I come out of that but cant find anywhere that I need to install it on um, nor does it play itunes music ?? Am I doing something wrong ??

Thanks for your help!

Do you have protected m4p files or free m4a?

I dont know!