WWW / BROWSER QUESTION:
Why can't I add all search bars to my search list ?

Usually you are on the search page and click the dropdown list of existing search and sometimes it has "add *xyz searchengine" but often doesn't... is it the browser or search page not adding something?

example:
this search engine doesn't seem to have a way to add:
http://gigablast.com/

or even my website bar on right
http://freeschool.0id.org/