Step 1
Visit facebook  Developers 

Step 2

Select Like Button under Social plugins

Step 3

Past you Website / Blog URL under Get your Like button code

set the Width, Layout, Action Type as you want


Step 4

 Click 'Get Cod'

Step 5

Under HTML/ 5XFBML / IFRAME / URL opposition

 Select  IFRAME and get the cod


Step 6


Visit you blog / Website 

Widget -> HTML cod and past it.and you will get the FB like button for you website