Simple Searching
Type your search into the search box at the top right of the screen: 
As you start to enter words into the box, Answers will match on pages and attachments that have those words in the title and show you an abbreviated list of the pages found: 
You can click on one of the page links to go to that page, or . The list displayed is not all pages that are relevant to your search. The pop-up list displays the first 6 pages, the first two attachments, and the first three matching names. At the bottom of the list is an option to search Answers and generate a complete list (you can also press Enter when you are done typing terms to perform a full site search and get a list of all the pages that include your search terms). 
The screenshot below shows the first three results from a search for full searchfor "MySlice errors" (retrieved by pressing Enter after entering the keywords in the search box) :
If you misspell a word, or use a word that has pages with similarly spelled terms, Answers may suggest alternative search terms for you to select: 
You can click on the suggested term to perform a search using that term.
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More Advanced Searching
Exact Phrase:
...
"Outlook 2010" AND SUmail
Search Help
From the search results screen, you can get help by selecting the question mark next to the search box
Search Filters
If your search returns a large number of results, you may want to use one of the search filters available on the search results screen. You can filter by author, space, when the page/attachment was last modified, or content type. A filter becomes effective as soon as you select it.