How to add Facebook like button below post?

Step 1:

Go to Blogger > Template > Edit HTML
*> click proceed for upgraded interface

Tick the "EXPAND WIDGET TEMPLATE" tick-box below as shown below

Step 2:

Find the code
*you can click Ctrl+F to find it

<div class='post-footer'>

Then paste this code under the code above,
Style 1:
Style 2: