1- Go to your Facebook profile
2- click on "Profile" in the top right
3- click on "add badge to your site" in the lower left
4- choose a badge type (profile, fans, with photo...)
5- if you want, modify the badge to customise it
6- go to the page of your site where you want to insert the badge and create a new block. (leave the Facebook page open)
7- click on "body" and on the "Source" button
8- copy the following code:
<div class="eaKeep">
<...facebook code...>
</div>
9- paste it into the block of your page
10- go back to the facebook page and copy the code of the badge
11- go back to the block of your site
12- paste the facebook code in the place of
<...facebook code...>
13- click on "source"
14- OK
