Scopus allows you to search several different ways: by document, author, affiliation, or advanced search.
To perform a basic search, type your search term in the "Search for" box. You can limit your search by the dates the articles were published, type of document, and subject areas. Then click on "Search". Below are the results of a search. If too many results are pulled (in this case, over 129,000) you can always narrow your search results from this page. On the left side of the screen you are able to search within the results, or narrow down by year, document type, language, source title, keyword, or many other ways.
When you perform a search and the results pull up, you will see several options under each title. If you see the option "View at publisher" you will be able to access it in full-text. Otherwise, it will only show you the abstract. If you click on "View at publisher" the full-text of the article will open for you, and you will also have the option of opening in PDF full-text from that page.
To perform an advanced search, click on the "Advanced Search" tab above the search box on the Scopus homepage. This will open a new search page where you can add your search terms using Boolean operators (AND, OR, NOT). You are also able to add an author name or affiliation.