Okay let's see here.
You have already enabled customization by:
-Turning the light on.
-Unscrewing the tube until the battery turns off.
-Screwed the tube back in.
-Clicked 20 times, then pressed and held until the light displayed dim to bright, then turned off.
From there you have to:
-Turn the light on.
-Triple click, then hold and release.
-(It should be doing a long flash pattern after that.)
-Single click (should only be one more click) until you see a three flash pattern.
-Once you see the three flash pattern, you hold down the button until the light turns off.
-(You will have enabled the Button Lock feature.)
If you want to disable customization after this:
-Turn the light on.
-Triple click, then hold and release.
-(It should be doing a long flash pattern after that.)
-Single click (should be five clicks) until you see a dim to bright pattern.
-Once you see the dim to bright pattern, you hold down the button until the light turns off.
-(You will have disabled the customization feature.)