Increment by One
Tap the round circle to the right of the LED slider to increment by 2 (which is the smallest value).

Lock for Lift
Note: when you slide to a number you want, don't lift off immediately. Keep your finger in place and you'll see the slider shake. Then you can safely lift off without changing the value.
Also Note: LED Colors include Black and White at the very right side. On the left side, you have the page color for controls.