Hi Slideit
We have tried to make the plugin less complicated. All you need to do is add those lines wherever you want the like dislike option to show up. And there are different code for like and dislike and some people would only like to show the like part or dislike part.
Yes its a bit of work but then it ads the option to include it anywhere you want it.
Let us know if you find any other issues. Also we have this other plugin which is pretty basic too.
http://wordpress.org/extend/plugins/simple-html-slider/
Also you can find more interesting plugins at
http://www.wpfruits.com/downloads/wp-plugins/
Thanks
Rahul