semperplugins.com official

Hi,
I decided to use your plugin but when I look at your official pages view source for seo, I couldn’t see any meta.

<meta name=”description” content=”xyz” />
<meta name=”keywords” content=”x,y,z,” />
<link rel=”canonical” href=”#” />

Are these things necessary?

Thank you.

http://wordpress.org/extend/plugins/all-in-one-seo-pack/