Basically when I browse your site the page Url's read
http://www.sigtraders.com/howitworks...b94cbffa0d94b9
You need to eliminate the Session Id from the url. Every user has a different sessions id when browsing your site. Because of this a search engine spider will see a different page for each session id. This will make ranking nearly impossible.
I'm not sure how the site was made but you can use session information without using the "get" function which you are currently using. Depending on how complex your site's code is, this could be relatively easy or extremely difficult.
As far as programming goes, the session id is stored with each user that is on your site. You just need to remove it from the url's and take it directly from the visitor on the pages that you need it on.