Sassie is not a job house: Sassie is a computer program like Microsoft Work, or MSN Explorer or Mozilla Firefox.
If you are thinking that SASSIE is where you get your jobs, think again. It is the companies, and I know Jacob has a great list around here. Great way to start: Get a free version of Roboform (you will buy it later, I promise), and sit one night and fill out every companies form on Jacob's list. A great company in my area may be nonexistent in yours.
Another popular program that the shops use is Prophet. Personally, I like SASSIE better, if only for its ability to save (save, save, save!)
Sorry if I misinterpreted the question; we all three had our own takes, trying to give you what you wanted. If all you were asking is how to sign up, I am signed up with 50 companies, and it is still a treasure hunt to find the "Shoppers Sign up" link. Good practice for filling out forms later, lol, some sites are very inventive. Good luck!
Wannabe scheduler or editor,
Beth