First time user: How to use indole-3-butyric acid on phalaenopsis orchids

[yomnaorchids]

Hey guys!
I want to know how to use indole-3-butyric acid on my phalaenopsis orchids for encouraging root growth. I have indole-3-butyric acid potassium salt. How do I make a solution (bearing in mind I don't have a kitchen scale that can measure small amounts)? And how do I use it on my orchids, just spray on the stem?

I am a beginner here so any explanations would be very helpful.