#2 Manual method

So in the manual method, you should have a knowledge of HTML coding. 

How to apply Blogger Themes on your Blog?

Step 1. Sign in to your blogger
Step 2. Click on themes as shown below.
A window will open like this

Step 3.Now click on Edit Html as shown up
Now you can change the theme if have a knowledge of HTML coding
And here you have changed the design of your blog