lattice problems..

im just starting to learn how to do couple of things now and i was learning about lattice and making dolphines
sometimes when i click on dophine then on lattice to do lattice deform
it changes the shape and sometimes it doesnt
can someone explain this for me and how to properly do lattice deform?

http://wiki.blender.org/index.php/Manual/Animation/Lattice_Animation

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ah thnx very much~
this site is really fast at responding