Step 1. Starting BubbletonLab
Type "bubbletonlab" at a unix shell command prompt. A small menu window should pop up.

The BubbletonLab main menu

Step 2. Loading a BubbletonLab surface specification file
On the menu, choose "File | Open BubbletonLab File". A file panel should pop up.
Click the "Library" button in the panel.

The Open File panel (File | Open BubbletonLab File)

Double-click on "poles.surf" in the right window of the panel.
The panel will close.

Step 3. Computing the surface
On the menu, choose "Controls | Compute Surface". The viewer window will appear with showing the the graph of the real part of the complex function 1/(z²-1) with poles at 1 and -1.

The iSight viewer window

Drag the mouse in the viewer window to move the surface.