If you mean the album art to a jewel case lid, that's easily done.
Open a new 'Jewel Case Lid' project in Discus and select 'Photo'
Select the song in iTunes to make the album art appear.
Now drag the album art from iTunes to Discus and the album art is copied.
Afaik most album art imported from the iTMS, is 600 pixels square, so you have to adjust the size a little bit to fit in the 'Discus' window.
In my experience I have to adjust to 103% (top slider).
If you want the song names to appear on your jewel case lid or on a jewel case base, here's how it is done:
If you still have the playlist of the CD you burned in iTunes, select that playlist in iTunes and choose 'Export Song List' from the 'File' menu.
Before you select the location where to save the file, choose 'Plain text' as the format.
Go back to Discus and select the 'Text' tab.
Choose 'Track names from iTunes export file...' from the 'Import' menu and select the textfile you just saved.
The next window gives you the option to import the items you want to see.
Click 'OK' and a new text window will appear on top of your album art with the items you chose.
Choose color, font, size, spacing etc. Lots of options.
Explore and have fun.
M