Can change font size and color?

You must add a rule in the CSS of your theme !

when ? all plug in hava css integrate that no ??

The CSS of the plugin is in the file wp-content/plugins/statpress-visitors/css/pagination.css

You can modifie it and add the rule you want.

which rule i need change for size font and change color?

have solution?

With Firebug it seems you need to change the css rule of your thème in the line 990

.footer_one_third {
width: 290px;
float: left;
margin: 35px 45px 35px 0;
text-align:left;
}

add this:
color: white;

then the rule is

.footer_one_third {
width: 290px;
float: left;
margin: 35px 45px 35px 0;
text-align:left;
color: white;
}

Perfect thanks you