Adding the Site Logo
You can upload a logo image to appear in place of your site title. Adding a logo to your Blogger blog is a great way to personalize a website or add branding information.
Clicking your logo image always leads to your homepage.
How to Upload a Logo
To add your logo, follow these steps:
- Go to Layout > edit the "Header" gadget > select Upload image from computer and click Browse...
- Select Instead of title and description from the placement options.
- If you want to add a description under your blog title, fill in the Blog Description field and select "Have description placed after the image" from the placement options.
- After uploading your image, make sure that you do not click on "Shrink to fit".
- Click Save at the bottom right to activate the logo on your site.
See the image below for more info:

Note: You can change the size of the header image from Theme > Customize > Advanced > Blog Header.