how to load a "red rider" BB gun?

Answer 1

There is an excellent article here:
http://experts.about.com/q/Guns-Firearms-Projectile-1501/1952-daisy-red-ryder.htm
If you remove the shot tube (That portion of the muzzle,
and the tube - about 12" -14" long (+ or -)) [CAUTION,
use only your hands to remove this tube - NEVER USE
PLIERS OR ANYTHING MECHANICAL, AS YOU MAY DO MORE DAMAGE THAN GOOD.] take a look at the chute at the bottom of it. Try dropping a b.b into the top of the chute and see what blocks it from entering the bottom of the tube. The sides may be too close together, or there may be some foreign matter blocking the b.b. If the chute is too narrow, you may be able to open it with a screwdriver by puttig the tip of the driver blade inside the slot and twisting it slightly. Be careful - DO NOT BEND THE TUBE!!!

If that seems clear and the b.b drops into position within the tube - perhaps there is something in the main barrel that is stopping it. Get your handy dandy flashlight and take a peek. If there is something in there, like a spider web, debris, or anything that doesn't belong - use a clothes hanger, wood dowel, or anthing that will break it loose so you can dump it out. (I have
even seen rusty b.b's clogging the bottom of the main barrel. AND, this is the case, you must be very careful you don't twist the shottube out of "true". Again, Use only your hands to turn the shottube - NEVER A PAIR OF PLIERS OR ANYTHING MECHANICAL - as you will only do more damage.

Answer 2

You will shoot your eye out with that thing!!!