I am no techie but Facebook made adding the Like button to your website fairly easy:
Go to developer.facebook.com to register your site. Within seconds you will receive code to add to website for the Like Button.
I placed this code at the top of my sidebar code in wordpress.
For wordpress, click on Appearance, then Editor.
From there go to: templetes and sidebar.php
I added the code facebook provided.
Don’t forget to save the update at the bottom of the page.
The great things is when someone clicks on your Like Button, it will be posted on their facebook page with a link back to your website.
I hope this helps. Comments welcome.