In order to do this,  

1. Click the dropdown next to your magnifying glass and choose "Find more Providers"
2. Under "Create Your Own" 
     a. your URL will look something like this:
http://SHAREPOINTSITELOCATION/_layouts/searchresults.aspx?k=TEST&u=http://SHAREPOINTSITELOCATION
Note: when entering any URL here, the "TEST" becomes your query that is typed in the seach textbox, very cool indeed!
     b. Choose whatever name you want (ie "Accounting Sharepoint Search" "Portal Search", etc)
3. click "Install"