hello i got this here package

http://our.umbraco.org/projects/website-utilities/poll

i tried fiddling with the umbraco installed package - but unfortunately it removes the backend files i need to style

but

there also is a source code file - but i dont know how to install said source code without messing up umbraco ?

or is it just copy and paste ?

if anyone has experience with this and wanna educated a newbie in this regard i would be most appreciate