jmc256

I have recently bought a 4-8x POSP scope for my Saiga .308. I have it installed and I have it pretty close to being zero at about 100 yards. Now I don't know what I need to do so I can use the rangefinder abilities and adjust as needed to shoot farther. Also how do I use the rangefinder itself? I have never had a scope like this so I really know nothing about them. If anyone can help me I would be very thankful.