Here is the simplest way to remove “Simple Template. Powered by Blogger” from your Blog.
Please follow the below steps:

Step:1

Open your Blogger Dashboard




Step:2

Click on Layout


Step:3

Click on Add a Gadget


Step:4

Click on HTML/JavaScript


Step:5

Enter the follow Code in Configure HTML/JavaScript

<style>
#Attribution1 {
display: none;
}
</style>

Step:6

Click on Save


Step:7

Click Save arrangement.

Step:8

You are Done. Check your Blog Now.

Comment here if you face any problem in the code.