JMoney can be installed in various ways. However, you need a running Java environment which is available at http://www.java.com.
If you have Java Web Start, then simply click on the this icon:
Mac OS X users should have Web Start by default on their system.
Unzip the JMoney distribution file. At the command prompt, change to the directory where you unzipped JMoney and type the follwing:
java -jar lib/jmoney.jar
That's it! JMoney should run now.
On some systems (e.g. Windows and Mac OS) it may be possible to start JMoney just by double clicking on jmoney.jar.
There is a separate shell script for Unix systems named jmoney in the root directory.