To get search engines to categorize and index your content, you still need to use keywords. It's the quickest way for them to do that.
You should put a keyword in your title; in the first paragraph of the article, once midway through and in the last paragraph. But, the first two are probably the most important.
After you have your article in place, go to the POST SETTINGS on the right side of the blogging area. In Labels input the keywords relevant to the article.
Then, scroll down to the SEARCH DESCRIPTION area. Put a keyword effective brief description. This is as important as using keywords because if a search engine picks up the article to use as the results of a search query, they usually use the description you create to go along with it.
I have a Slideshare overview of optimizing a Blogger blog post at:
It's pretty much the same for optimizing a WordPress blog post also.
Carolyn Howard-Johnson, author of This Is the Place; Harkening: A Collection of Stories Remembered; Tracings, a chapbook of poetry; and how to books for writers including the award-winning second edition of, The Frugal Book Promoter: How to get nearly free publicity on your own or by partnering with your publisher; The multi award-winning second edition of The Frugal Editor; and Great Little Last Minute Editing Tips for Writers . The Great First Impression Book Proposal is her newest booklet for writers. She has three FRUGAL books for retailers including A Retailer’s Guide to Frugal In-Store Promotions: How To Increase Profits and Spit in the Eyes of Economic Downturns with Thrifty Events and Sales Techniques. Some of her other blogs are TheNewBookReview.blogspot.com, a blog where authors can recycle their favorite reviews. She also blogs at all things editing, grammar, formatting and more at The Frugal, Smart and Tuned-In Editor .