[Plugin: pixelstats] how to use all those functions

I took a peek into Plugins > Editor > pixelstats and found loads and loads of functions that look usefull. The thing is i am clueless as to how to use these. I dont know the format to add a function into the theme editor.

Here are some function that are already built in
function _display_views_per_day
function _display_views_single_page

and more. can someone help me on how to add these in