This time I do it with a balanced control of chakra and effort,I hit it again with the protruding lightning chakra from my finger tips.some indentations appear on the dummy but no burns.If you don't see any changes, then put a little bit more chakra and effort into it. Not too much chakra or you'll be wasting chakra and exhaust yourself, and not too much effort or you'll exhaust yourself that way too. It should make some small indentations into the dummy, and maybe a small burn. Keep trying.
I did one more putting a little more chakra in the attack and now it burns a little.