Hi,
in your dialog, if you click on the "USB" icon, does it open the Peripherals perspective for you, or not?
Also other possibilities there are available:
- in the main menu there's ConfigTools menu and "Peripherals" in there.
- context menu on the *.mex file in the "Project Explorer" has also the "MCUXpresso Config Tools" containing the "Peripherals" item which should open the right perspective.
Regards,
Libor
P.S. For unknown reason I cannot paste screenshots of the above, but it should be quite easy.