help calibrating a Sigma 1606 L Bike computer

I need help calibrating my bike computer. I have been getting some really funky readings since I replaced the battery. I'm pretty sure it is showing me having too much distance. My wheel size is set for the 700 x 22c wheels but I'm not sure I have the rest of the set up right. I looked up the user manual on-line and it seems to be pretty vague on certain things. I was wondering if there was any "bike gooroo" out there that could help me?