Instructions
Check the action of your SKS to make sure that the weapon is unloaded. Never attempt to fold the bayonet while the weapon is loaded.
Pull back on the hilt of the bayonet, when the bayonet is in the extended position, and fold the bayonet downward and to the rear of the rifle. Lightly press the length of the bayonet against the bottom of the barrel; you will hear the spring mechanism click, locking the bayonet into the folded position.
Pull the hilt of the bayonet, when the bayonet is in the folded position, toward the back of the rifle to release the spring mechanism. Rotate the bayonet downward and extend it in front of the barrel. The spring mechanism will lock it into place when you have fully extended the bayonet.