How do you plink on a Hori Fighting Commander 3 pad?

Any tips?

Support the controller using only your left hand, all it should be doing is holding the controller and doing the d-pad motions. Your right should be positioned hovering over the buttons, much like you would on an arcade stick. This way you can use multiple fingers to plink your commands.

Check newbie section and SF4 section, read all the stickies, they explain what plinking is and how it works.