Hello i dont understand this new Version i dont know how to change the post title colour!Really complicated now .
padding: 0;
margin: 0;

What is that?

http://www.w3schools.com/css/css_margin.asp

http://www.w3schools.com/css/css_padding.asp

Margin is the space around elements.

Padding is the space between element border and element content.

Ok but how do i change the post title colour?

See Atahualpa Theme Options -> Post/Page Styling

Add

color: #123456;

to

HEADLINE Box: Text

to change the color of post/page titles on single post pages and "page" pages,

and edit

color: #......;

in

HEADLINE Box: Links and HEADLINE Box: Links: Hover

to change the color of post titles on multi post pages such as homepage, category page...