NOTE.
To enlarge image:
1. Right click.
2. Click "VIEW IMAGE".
INSTRUCTION:
1. Go to your blog. Select "DESIGN" (Upper right hand corner).
2. You are in "ADD AND ARRANGE PAGE ELEMENTS". Select "EDIT HTML".
3. You are in "EDIT TEMPLATE" and look for this.
4. Now add this code.
#header-inner img {margin: 0 auto !important;}
#header-inner {text-align:center !important;}
1 - Look like this. "2 - PREVIEW" and "3 - SAVE TEMPLATE".
5. Last step click on "VIEW BLOG".
6. The result..
Before.
After.