gildarts

I tried pressing page up/down but nothing happend. Made me believe that maybe those buttons didnt work in my keyboard so I assigned the zeeroing on different buttons but it still didnt work. Maybe I have just misread this item and zooming in is not possible on it. ACOG Optics test (Advanced Combat Optical Gunsight with 4x magnification level. Attachable to any weapon with a standardized rail system. Factory default zeroed to 100m and manually adjustable to 700m.)

Hi. Please tell me how you can zoom in with a sniper aim. I got a aim that say that I can manually adjust it to 200-800m and I have litteraly tried pressing every button on my keyboard but I have no idea how I can adjust the zoom range with a sniper aim. Please help!