1. Be on the surface of a planet (not in anything, as I recall).
2. Click on your CP total on the Information part of the character menu sidebar.
3. Go to the Exchange CPs link.
4. Put the number of ships you want in the appropriate box for the type you want. Leave everything else blank.
5. Hit the exchange CPs button.
And that should do it. Been a while since I got any myself, so if you need more detail, someone else might be able to be more specific.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."