When you create a blogspot site, the logo that will appear on browser tab or address bar is default blogger logo. To give identity to your blog and to look more professional, you need to change the default logo with your own. You can create a picture or text logo that in jpg, bmp, or png file.
Basically there are two ways to do it, easy way and hard way. Let’s try with the easy way first.
1. Go to your Layout section, and look for favicon gadget that usually place on top left.
2. Click on Edit text link, and click on choose file button. Just make sure your logo image is less than 100KB. Don’t forget to save it.