HOW TO change blog template

Part 1
Finding a template for your blog.

Step 1.
Search for a site that houses various blog templates... 

Step 2.
Browse among the templates provided.

Step 3.
Download it.

Step 4.
Be sure that the extension name of the template you had download should be XML. If not, try other available templates.

Part 2
Integrate the template to your blog.

Step 1.
Go to your blogger account.

Step 2.
Click Template.

Step 3.
Click Back-up and Restore

Step 4.
Choose file--> Find for the template you recently downloaded---> Upload.

Step 5.
Fix the layouting of your blog.
Click Layout (left pane) and try rearranging somethings you wanna change.