Aloha greennc,
It's about changing the information, the energy in that area or those areas affecting it.
If you have the Level Two course, remember the part about working on the "good" side's toenail first, then work on the one with the misinformation, so it can copy the other.
You can work on it a couple times a day. It doesn't have to be long, just focus on the "good" toe/nail and then bring that message and attention the the other.
Much Love,
Shawn