Ok, so what you want is an example.
It's very, very simple. The man page tells you how to format the string. You can get the variables from the cgi script your web server will be hosting.
For purposes of an example, pretend your cgi has two variables/keys named "computer" and "style". A wget command might look like:
wget --post-data="computer=hosts&style=list" http://www.example.com