You just link the keywords in your articles to relevant pages in your site. Let's say you are writing about "used SEO" and there is another page in your site that lists used SEO Link. Pick a few keywords in the article you are writing, and make them link to other page (the page with the used car listings). Use complete links (starting from the http)... so if someone copies your article, the link will still work. Finally, watch your page rank increase overtime.

Keywords in Anchor Text:

There are a number of places you should use your keywords on your website to make sure you get the most relevancy from them. The first and most important for internal linking within your own site is the Anchor text of links on your own pages that link to other pages within your site.

A classic mistake is to link back to you home page with the phrase "home" or "home page", this is a waste of Page rank? You should always use your primary keyword phrase in the anchor text. Home You should also use other relevant keywords for each of your pages and use them for your internal navigation links.

This will help to make sure your home page and other pages have relevancy in the Pr that you use within your site.