Terrahax problem

When I start "Terrahax" trough steam it wont start. it says: Launch from Steam Client

You have steam account? if yes did you replace terraria.exe with already existing program in your Steam/Steamapps/common/Terraria ?

I have Steam. I have done all that.

And u launch Terraria through Steam or through terraria.exe ( do you bought terraria or you added it as a " non-steam game ' ? )