To make a ramachandran plot:

• Read in a protein structure (File/Open or PDB Search)
• Select the structure you wish to build the plot for. You can do this by double clicking on the name of the structure in the ICM Workspace (a selection is highlighted blue in the ICM Workspace and green crosses in the graphical display) or you can use the right-click button and drag it over the whole structure in the graphical display.
• Tools/Analysis/Ramachandran Plot
• A postscript file will be saved.

A postscript viewer needs to be downloaded onto your machine in order to view the plot. This can be downloaded from http://www.cs.wisc.edu/~ghost/. Once this software is downloaded you need to tell ICM where it is located by typing the pathname into File/Preferences.