I'm working with EPiServer Demo for a week or little more and very like it. But I have some problem with understanding some features. It would be great if anybody can give me an explanation.

I've made a simle website in two languages and included the QuickSearch control is delivered with the demo website. I created my own Search page for showing results.
My problem is: after submit the website is redirected to DEMO Search result page, but I would like to redirect it to my NEW Search result page (moreover in current language). I found some code in QuickSearch control:

PageReference searchPageRef = CurrentPage["SearchPage"] as PageReference;

if (searchPageRef != null)
{
PageData searchPage = GetPage(searchPageRef);
_searchPageUrl = searchPage.LinkURL;
}

The property CurrentPage["SearchPage"] returns DEMO Search result reference.

How can I set the property for example "MySearchPage" for getting my search page reference CurrentPage["MySearchPage"]?
Where in the admin tool is it possible to set that values for pages?
How the string id "SearchPage" is related to the DEMO Search page?

Under Site configuration section I found some settings:

Logotype 
Contact page  
Privacy page  
Site map page  
RSS Main Page

But there are no ways to add a new one.

Thank you