Problems installing IDLE2HTML

I'm trying to install IDLE2HTML from the following link in order to print from IDLE in color. I use Python 2.7 on a Mac.

I follow the instructions from the readme.txt, but when I reload IDLE nothing has changed. I don't have the Save As HTML option.

In the past I've installed and reinstalled Python a few times.

When trying to find my idlelib folder (as written in the readme instructions), I eventually found it under the path /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/

Is my problem that my python is in /System/Library/?

Any ideas please?