by default, nukes is available via /nukes, not /.
in any case, if you are installing from source, edit the local.properties file that is in the "build" directory and change the entry for the context-root.
if you are not installing from source, you're most likely going to have to open up the nukes.ear and modify the application.xml file to change the context-root location.
Actually the binary that I downloaded was using / not /nukes. I exploded the ear and edited the application.xml in the META-INF dir to relect /forum and it works like a charm. Thanks for your input.