Sample code?

This looks like a great plugin but when testing it, my site got locked down. I renamed the Start file to Stop and got it back. Can anyone provide some simple test code to try this plugin. I got code from a video but that;s what crashed the site.
function remove_screen_options(){
return false;
add_filter(screen_options_show_screen,remove_screen_options);

The above is suppose to turn off the screen options tab. Is there a problem with the code or should I try another test?
Thank you

My Goal is to be able to set a query statement to a category that I pass to the page using a URL.