Mozzila don't you know Ask.com sux?

I have loved Firefox ever since I first used it. Always thought it was much better than ie or even the new google browser called chrome. Have a problem with it now. When I type in the main browser to get info the search engine is ask.com, trust me this search engine sux
I have been working to correct this problem all morning, to no avail. I was able to fix it in my internet explorer 7 but as I said I like Firefox much better. Firefox is customizable and has many themes add ons and plugins. I can work around this issue, have a small google bar on the right of my browser and my home page is a google page, I just would rather the default search engine on Firefox be as it was in the past, Google

If you know an easy way to fix this disaster please let me know