By default, just having the plugin installed is a good thing because it rewrites your web page titles and helps restructure your URLs to be more search engine friendly.

1) Login to WordPress

2) Add a New Post

3) Write Your Post

4) Copy and paste your post title and select roughly 160 characters of text that you would like to appear in your ‘description’ when Google indexes your site into the All in One SEO Pack

Your Site Title and Your Google 'Description'

5) Paste it in the All in One SEO Pack plugin that is located below your text input window like so (remember to add a few tags you would like to include in your meta tags of your page):

6) Click ‘publish’ or ‘update post’ to save your changes and add these descriptions to your page.