A PLR article is an article that you can do whatever you want to! You may choose to keep the article as is. You can choose to add to the article to make it your own style. Or you can delete parts of the article or use snippets of it. When you buy PLR articles, it is yours to do with what you want.
Looking for a way to generate traffic using these articles? Some people submit articles to various article directories to generate free traffic from the resource box you can add at the end. When you submit articles to the reprint article directories, other webmasters will copy the article and put it on their site. If you have a resource box at the end of your article, this will gain incoming links to you as well as free targeted traffic.