To turn off the LED you go into Profiles (I usually just click on the little speaker in the upper right corner, where you set it to vibrate). Scroll down to Advanced Options... Scroll down to your usual default profile (I usually only use phone only, to it's already selected on mine). Click on it, scroll down to what you want to change, click, and pick what you want.

Note that if you don't change it on all profiles, it will blink when you're on vibrate or silent or whatever.

Karen