How can I copy an MP3 CD into iTunes?
That article is for importing audio CDs. It does not apply to MP3 CDs.
An MP3 CD is just a CD with a bunch of files on it. Copy the files to your hard drive, remove the CD, and then use the iTunes command File > Add Folder to Library.
Thats true, but most CDs comes out as WMA. and iTunes automatically converts it to m4a (i think). Plus I forgot this link: iTunes: How to convert a song to a different file format
Allowing rosicaformosa to convert his OR her iTunes songs into MP3.