If you are reading this, chances are that you already know what SMF is. If not, here you go. Quoting from their homepage:
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes.
Its powerful custom made template engine puts you in full control of the lay-out of your message board and with our unique SSI - or Server Side Includes - function you can let your forum and your website interact with each other.
SMF is written in the popular language PHP and uses a MySQL database. It is designed to provide you with all the features you need from a bulletin board while having an absolute minimal impact on the resources of the server. SMF is the next generation of forum software - and best of all it is and will always remain completely free!
SMF is the best free forum script in our opinion.
This tutorial explains the steps using which you can install 

Google limits the number of ads that you can place in your blog per page. When you place the adsense code by modifying index.php so that the ad appears below a post, the ad is going to appear beneath all the posts on your blog’s homepage. This is not what we want.
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