Title Tags & Description Tags

Hi,

Is it possible to change the Title Tags and Description Tags in magazine theme?

At the minute the title tags just say - Site Name | Page Name. As you will be aware, title tags are important when it comes to SEO, and ideally we would like to have control over what our title tags are and add some of our keywords in there.

I also cannot find anywhere where I can change our site description for search engines - at the minute it says "www.4.biz. ... http://www.4.biz sales@4.biz website launch February 2010." which is what our description was before we started working with WPMU. Clearly, we need to change this as nobody will click on our site with the description as it is!

Many thanks,

Damian.