Logos are left aligned by default. Some people want them centered. Follow the steps below to accomplish this.
1. More Actions
2. Manage Site
3. Site Layout
4. Change logo
5. Select No logo, OK
6. Change site layout
7. Header height: Use logo size, or select pixel height if you want, OK.
8. Save Changes
9. Colors and fonts
10. Site header background color: None
11 Site header background image
12. Browse to your header image
13. Select Repeat: none, Horizontal Position: Left, center or right (as desired), Vertical Position: top, bottom or center (whichever works for you).
14. Save Changes
15.You will note that your header logo will no longer be a link to your home page. If you want this, create a transparent gif or png graphic the same size as your header. Go back to the change logo step and select your new blank graphic.