Adjusting clasp on a Timex watch

Question

Just bought a Timex for my wife - from the Diamond Collection. Appears to have a foldover clasp for the bracelet, but I need to adjust it. The provided directions are not very helpful. Any suggestions?

http://www.timex.com/gp/product/B000VLXJCY/sr=1-7/qid=1198600818/ref=sr_1_7?ie=UTF8&m=A1S5XB33AHYRMX&n=378769011&timexBrand=core