So i have this straight line which is transparent png file and only the line which is black i really need to turn it to grey I hope someone knows how. I tried awready moving all those sliders around but it failed 
Those colors are getting multiplied by your black line, and since black is 0, the result is always 0.
I’m afraid you can’t change the texture like that. What you can do is make a material and use this texture as a mask, then you’ll be able to set any color you want there.
Ok i will try that ty!
Will the line still be transperant so i can use it as it was befor and what settings do i need to choose there to make this work