As you would any bow sight, on flat ground. Most start sighting it in at around 20-25 yards depending on your arrow speed. After you have it zeroed in on flat ground it should be good to go at elevation. It's a good idea to shoot at a couple of targets, at a known distance from your tree stand, just to reassure yourself it's working fine.
You would have to either get a new bow or a new sight.
Twenty five dollars
The cut out section of the bow above the grip.
the target
It would be worth approximately $125.
A bow sight is adjusted by moving the pin in the direction of arrow impact. If the arrow is high of the spot, move the pin up. If the arrow is hitting left of spot, move pin left. etc. Just rember dont move the sight for the first few arrows, it might just be tou torquing the bow and not the sight.
300 yards
A bare bow cannot have any sort of attachments or sight on it. A standard re-curve bow may have any attachments the shooter would like on it. This distinction is usually only used in tournaments.
Compound pendulum is a physical pendulum whereas a simple pendulum is ideal pendulum. The difference is that in simple pendulum centre of mass and centre of oscillation are at the same distance.
A shorter pendulum has a shorter period. A longer pendulum has a longer period.
The longer the length of the pendulum, the longer the time taken for the pendulum to complete 1 oscillation.
bifilar pendulum