Did your kit come with instructions? You are using a wet kit, right? If you have insturctions, follow them. If not, use the t fitting and tap in to the fuel line before the rail. DO NOT tap in to the return line! You do not need to (and don't) touch the "regulator".
If it's a dry kit you don't tap into the fuel line. Perhaps they were suggesting you up the fuel pressure for nitrous use. However, you need an adjustable FPR to do this. I don't know much about dry kits. Wait a while...someone with more dry kit knowledge will chime in. I think AaroNX is running a dry shot, you may wanna pm him.
Also, you may hold off on the install untill you have a better understanding of how N20 works. It's real easy to wreck your engine if you're not sure what you are doing...especially with a dry shot. Just my $.02
I'm pretty sure that if you're just running a 50 shot dry that your stock FPR should be fine. If you do go above 50 then you might want to look into that AFPR, but like Jester said, you might want to wait until you've got a little better idea what you're doing. If you don't want to wait then you might want to have someone who knows what they're doing help you install it. JMO.