Editing your HTML meta-tags is the easiest SEO method in the book. Of course you need to learn about HTML coding first but even graphical web development tools that allows web design without HTML coding can do the job. Just go to HTML or source code view mode and you’ll see your meta-tags. You can then edit right there by inserting your keywords.
But be sure your meta-tags match your site’s content. Nothing can be more disappointing to your visitors than to get to your site only to find your content doesn’t match or is different from what it was searched for. There’s really no substitute for having good site content. And your meta-tags that properly match is a good SEO trick. But being tricky is another thing.