Search Indexing & Events or Documents

Hey there, I'm attempting to set up a search index the documents & files module for sitefinity, but in the sitefinity search index asks for the "default page where documents are published" and only gives me the choice of the pages I create.

Looking at this: www.sitefinity.com/.../
"When you select a content type for indexing, you must choose the default page that this type is published on.
This is the page where the item opens by default.  "
I don't understand what this is referring to; I was under the impression the default page is the library's url you can find under manage libraries, but I have no option to select anything like that.

Edit: It seems to work anyways when I point it to the page Im searching on, but why is the search so strict? I have a document titled "testdocument" and searching "test" brings up 0 results.