How to Change the Theme of your Blogger Site

Steps to change the theme of your Blogger site:

1. Log into your Blogger account and go to your blog's dashboard. Click on 'Theme' on the left sidebar.

2. This will open the theme gallery where you can browse through different theme options. Click on a theme you like to preview it.

3. Once you've selected a theme, click on 'Apply to Blog' to use that theme. 

4. If you want to customize the theme further, click on 'Customize' once you've applied the theme. Here you can change things like the background, colors, layout, etc.

5. If you want to edit the HTML/CSS of the theme, click on 'Edit HTML' under the 'Theme' tab. Be careful when editing code as errors can break your theme.

6. Don't forget to save your changes! There is a 'Save theme' button on the Customize page.

7. To revert to a previous theme, click on 'Revert to classic template' under the current theme preview.

8. You can also install new themes from third-party sites. Just download the theme files and upload them via 'Upload theme' on the Templates page.