The needle will have groves, which the E CLIP (aka Jesus Clip) fits into. By moving the clip down (towards the tapered end of the needle), you will lift the needle and RICHEN your jetting. Moving the clip UP will drop the needle and LEAN the jetting. This only Changes the jetting from 1/4 to 3/4 throttle.
3/4 to Wide Open, you will need to change the Main Jet, which affects jetting from 3/4 to full throttle.