Support How to reassign default search engine? (Menu -> Search)

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http://androidforums.com – When I am at tap the Menu button, the menu pops up and shows four functions: Edit page, Create folder, Search, and Settings. I uninstalled the default Google search engine on my rooted phone, so now the Search function does not do anything when I tap on it. I want to reassign my default search to Multi Search, an app that inquire multiple search engines at once. How can I assign Multi Search to the Search function in the menu? (General)