Are you looking for a tutorial on how to use Kontakt3 itself - using it's parameters etc...
or are you looking for a tutorial on how to setup Kontakt 3 to work within Logic, e.g. setting up Kontakt 3 as a multi-output plug-in within Logic?
Steve H. has a section on gaining control over Stylus RMX and Kontakt 3 in the Logic TNT2:
Let me know what it is you are interested in learning.