Pull mode is the default mode for playing FoldIt. It's where you start out, and it's where you will probably do most of your work. The tools in this mode directly manipulate the conformation of your protein, and most of them will always result in a gain or loss of points.
In pull mode, you have access to the following tools:
Each is discussed in its own article, and they are different enough from one another that it's hard to say much about them together.