How to edit my robots.txt file

Hi,
I am having all kinds of trouble with my robots.txt file blocking google adsense as well as searches. I called Godaddy (my hosting provider) and they said the problem was not on the hosting side (After about an hour on the phone and having to connect with their advanced hosting people), I have looked through my FTP and cannot find the file anywhere to delete it. My site is Lifetimestocks.com and the robots file can be viewed at lifetimestocks.com/robots.txt and the problem is evident that bots are being disallowed (Maybe by link alias generator thing?) but i cannot figure out how to change it. My privacy setting is set to visible for search engines and i use SEO ultimate, but do not think that generated it. I would assume it came out of my site map generated which started out through the plugin BWP Google XML Sitemaps by khang minh but that plugin was deleted and i replaced it with google xml site maps by Arnie Brachhold