Search allows you to nominate certain criteria in order to search for a particular document(s) either by type, group, date, title, importance etc. depending on your user permissions i.e. you will not be able to view any documents relating to a group you do not have permission for.
The 'basic' search by default will allow you to enter in key words in the 'Title' field and choose via the 'Active' and 'Not Active' checkboxes what to include.
Upon entering this information, click on the 'Search' button and the results will be displayed.
If you require a more detailed search, click on the 'Advanced Search' link which will display more filter criteria to choose from.