Real Human Hair Extensions

Not to where you damage, but they look like a real part of your hair. I have yellow (yes, I know, weird / dyed myself which'll eventually wash) the extensions I'm hiding under a layer of my hair and people think it's true. The problem is that I either have to curl or straighten every day. How can I make them look less perfect and right and a little more wavy?

TY in advance.

get wet and put it in braids or buns and let air dry overnight

It works the girl on YouTube there (no video showing how it was done)

you can tease