Rigging Complete!
I finished painting weights on the entire turtle tonight so now it won't move weirdly.
What I mean by move weirdly is that if you look at the plain photo of the arm, it's not bending properly. That's because the software is just guessing how it will move. Because of that, artists have to go in and fix that, or in other words repaint what the software guessed. In the similar screenshot of this image, you should see a black and white gradient. That's the paint that has to be fixed.
In the last picture, that's how the paint should look like for the turtle to move properly. But not all 3D models will have weights painted like that. Different objects move different ways, but because the turtle is a machine, its shape doesn't change. In comparison to a human arm, there would be a gradient because a human's skin folds and stretches when it moves.
Now that this part is finished, I will be moving on to the animating process :D