Search Engine Description

Hi,

I’ve started a new blog and I’m having trouble changing the description of my website in search engines such as google. For example, if you search my site name (starting elevens) then it shows up 3rd choice, I believe. However, instead of showing my tagline it starts with my first post.

I’ve made websites with wordpress before, so I know I must be missing something here, but I can’t figure out what it is. I’ve used a number of different SEO packs and nothing has changed it, made an xml sitemap… I’m having trouble knowing what I should do at this point.

Any help would be appreciated.