If the bird is screaming, try to observe closely when and why. Move it to a new location, keep a toy that it really likes and give it to him only at that time. Make sure the bird gets at least 10 hours of sleep. Some birds even require a quiet time or nap during the day. Cage location sometimes can contribute to excessive calling and screaming.
Most Quakers are very social.
They are happiest where most of the activity in the house is. The bird can also be trained to step up onto a dowel. Step up should bee practiced everyday until it becomes second nature. Practice away from the bird's cage as much as possible, especially if the bird is cage territorial and to eliminate distractions. Praise, praise, praise.