The editor folder which contains the WrackEd executable can be found in your Wrack installation folder.
The basics EditWrack works with faces instead of 3D brushes. If you're unfamiliar with faces, it's basically a flat 2D shape. A corner of a face is called a vertex. These vertices are connected with each other and form a 2D shape.
Connecting these faces with each other gives you unlimited possibilities in shapes and forms.
Creating and editing a face Edit
To create a face, simply select the
Face create mode (shortcut key C) and right click in one of the 2D windows. Your mouse will now draw a line. Pressing your left mouse button will set vertices. Connecting the last vertex with the vertex you placed first will complete the face. To cancel the face creation click your right mouse button again.
After creating a face, you can always edit its shape by choosing the
Vertex mode (shortcut key V).
The top left window is a 3D view of your map. To navigate through this window, simply hover your mouse over the window and press enter. You can now move around with the (default) WASD keys. Holding the shift key will double your movement speed. To quit navigation mode, press the escape key.
The keys for navigating can be configured at Settings -> General Settings -> Controls.