Are you confused to change font color at your wordpress site? You can use HTML tag in wordpress visual editor to change your font color. But this method is hard for me with some HTML knowledge.
To change font color and format, you can use wordpress visual editor. You can activate this tab with select the Visual tab in the top right corner of the editor area. Select the kitchen sink icon to display second row of icons. You can access the complete information about this method at http://en.support.wordpress.com/visual-editor/