Changing Color

Can you please help me how to change this font color to black, what was the formula for this? I got a null error when i try insert a color on it. Hope you can help me, thanks.

There's an color pick up in the paint--> color of that circle.

I want to change the number into black, alongside with the blue color. Is it possible?

Yeah it's possible just go to the font color and change it.