See this support article:
https://support.mozilla.com/en-US/kb/Search%20bar#w_switching-search-engines

If the problem is with your location bar itself, or you already have problems with searches see:

• searches are redirected to another site and after reading that please explain what is happening.

You can modify the pref keyword.URL on the about:config page to use Google's "I'm Feeling Lucky" or Google's "Browse By Name" or another search engine.

• Google "I'm Feeling Lucky": http://www.google.com/search?btnI=I%27m+Feeling+Lucky&ie=UTF-8&oe=UTF-8&q=
• Google "Browse by Name": http://www.google.com/search?ie=UTF-8&sourceid=navclient&gfns=1&q=

• http://kb.mozillazine.org/keyword.URL
• http://kb.mozillazine.org/Location_Bar_search

i did everything that u said cor-el but it still redirects to search qu or something like that

See these threads about searchqu:

• [/questions/816181]
• [/questions/790833]