So with the help of this community and its archives I'm the owner of a new Windsor Clockwork roadbike. I'm around 5'4 and riding a 52cm. The bike is fast and nimble but one thing I really don't like about it is that I feel like I'm bent over way too much while riding. I talked to the guys at my local bike shop and they told me it's probably because my stem is too short.

How do I go about upgrading the stem on my bike to make it longer? I saw some parts on bikeisland.com, but I'm such a newbie I don't even know where to begin.