If you want to just rip Tracks from CDs, and are not concerned with cataloguing your physical CDs, you can simply rip a CD by selecting the CD or several Tracks on the CD (from the Locations or My Computer nodes), and clicking Tools > Rip Audio CD .
The Rip CD dialog will appear, from which you may configure:
Press 'Ok' to proceed with Ripping the selected Tracks.
Note: If you wish to interrupt this process at any time, simply right-click on the status bar near the bottom of the screen, and click Terminate. If you wish to reduce the amount of CPU cycles used during the process, you may similarly right-click on the status bar, select Change Priority, and choose a lower priority level.