Basically you implement your keywords by using them on your web pages. It's that simple! The first and most important thing to do is use the words or phrases throughout the text on your web pages.
Some people confuse adding keywords to a web page with the META-keyword tag. Tthe META-keyword tag does not count much in how well a web Page Rank, so adding your keywords here and nowhere else won't help you at all. You even get punished when you have keywords in your meta-tags that are not in your normal text!
Each section of your web page carries a different weight in the overall Ranking process. There are several section of your webpage that need special attantion.