Front sight has two adjustments... Windage (side to side) and Elevation (up and down).
Both require a tool to adjust. The Windage/Elevation tool comes with the SKS from some vendors - it's the tool that has the thumb screw? If you didn't get one with yer rifle, check the vendors (Milarm,Wolverine,P&S Militaria,Moving Target...) and get one. They're cheap =)
surplusrifle.com has a guide on sight adjustment. It's easy to do.
Rear sight is not supposed to move side to side. You might have to do some fiddling... With out a picture it's tough to reccomend a fix. Maybe the "ears" are bent and need to be staked?