To open the Twist tool, double-click on "Twist" in the Toolbox.
Enter values in the Angle X, Y, Z controls to twist any selected
points around the respective axes. Consider the following object:

Here is the object after setting an Angle X value of 45 degrees:

Note that the object has been twisted 45 degrees in each direction
out from its Origin, along the X axis. If you set
the Origin to "X Min", you get the following
results:.

To the right of Angle X, Y, and Z are three ControlChannels, which allow you to alter how
the points are twisted, based on their distance from the Twist Origin. Note the following change to the Angle X ControlChannel, and how it affects the end
results:


To interactively twist selected points, LMB Drag in any Camera View while Twist is the Current Tool. As you drag the mouse, any
selected points will be twisted around the two axes that arent Active. To twist selected points around the Active Axis, hold down either control-key while
you LMB Drag.