How to add artwork to iTunes albums that were torrented?

Hi, whenever I torrent albums this always happens, i've managed to get over it a little by letting iTunes get the album artwork for me when the info is locked by clicking "Get Album Artwork" but when iTunes doesn't have the album that I torrented, for example Boston's Corportate America album I have no way of getting the artwork, which I'm kind of OCD about when it's on my iPhone and iTunes. Is there anyway I can make it so its not transparent like in the picture and allow me to add artwork and edit the music?

Its very easy.first when your torrent is done, double click to open the file, then right click on the song and go to properties, then un check read only, then click apply all, then okay. After this you can download artwork and edit names and stuff. You have to do this everytime you download songs and other files.