How do you change album pictures on iTunes?

Is it possible to change album covers on iTunes? and if so, how do you do it?How do you change album pictures on iTunes?
if you click on a song there should be an empty box that shows up in the bottom left corner of itunes

all you have to do is go on the internet and copy any album cover and just paste it into the boxHow do you change album pictures on iTunes?
Okay.

Find the song that you want to put artwork on.

Right click on it, on the very top it says ';Get Info.'; click it.

Then go to ';artwork';. its the very last one.

Then click add, then put the picture up.

You can go to google and save the picture for your song cover, also.

The only downside is that you'll have to do that to EVERY SONG on your iTunes.

But its free :)
right click the song and then on the top of the window there will be a tab that says album art, then you can either copy and paste a picture from the internet onto there or save it onto your computer and upload it
1) Select a song

2) Get Info

3) Select Artwork tab

4) Change Artwork