Where do i go to edit the color of text where i would like to change it from grey to white and the size
Template or CSS, depends what your editing.
ok, whatever you say. What do you want to edit anyways? If you only want to edit a part of your site, use templates. If you want to change ALL the default text, edit Global CSS
i just want to edit the post part like instead of when you post somthing and being grey i want it to be white
You can do that in the post editor.