How do I add a search button to find specific posts in my blog (blogspot)?

I am so new to this and can't find a gadget that seems to work in blogger. I basically want to create a button where you click on it and it will find all posts that are an upcoming event in my blog. How do I do that?

And how do you add a basic "search your blog for..." search gadget to your blog?

-- you already have one - it's called the F3 key. Hit it and type in whatever you want to search for.

see if this helps

http://theedifier.com/blogging-blogger/make-money-earn-revenue-google-adsense.php#h