Meta description tags, while not important to search engine rankings, are extremely important in gaining user click-through from search engine result pages (SERPs). These short paragraphs are a way to advertise content to searchers and let them know exactly what the given page has with regard to what they’re looking for.
Insert > Head > Description
Type a paragraph describing your page. The paragraph shouldn’t be longer than about 150-180 characters long. It should also include your keywords.