To change the logo on your Blogger blog, you'll need to follow these general steps:
1. Log in to your Blogger account and navigate to your blog's dashboard.
2. On the left-hand side menu, click on the "Layout" option.
3. In the layout editor, locate the header section of your blog.
4. Look for the existing logo or header image element. It might be a widget or an image gadget, depending on your blog's layout.
5. Click on the "Edit" or "Configure" option associated with the logo/header element.
6. In the logo/header editor, you will have options to upload a new image from your computer or choose an image from your Picasa Web Album (if you have one linked to your Blogger account).
7. Select the desired option and follow the on-screen instructions to upload the new logo/header image.
8. Adjust the image dimensions, alignment, and other settings as needed.
9. Once you're satisfied with the changes, click on the "Save" or "Apply" button to update your blog's logo/header.
It's important to note that the specific steps may vary slightly depending on the theme or template you're using for your Blogger blog. If you encounter any difficulties, referring to the Blogger Help Center or the documentation provided by your theme's developer can provide more specific instructions.