Perhaps you need to start with some very basic web applications before jumping into JForum.
As I stated above, there isn't a registration process per se. There are two common ways that Tomcat runs a Java EE web app - as a virtual host or as a Context element within a virtual host.
If you do not have permission to modify your $CATALINA_HOME/conf/server.xml or add Context elements under the Tomcat conf directory then you will not be able to accomplish what you want.
Again, what did the Tomcat error logs have? If you don't know where they're at then you may want to back up a bit before installing a large Java EE application like a forum. It isn't hard but some basic debugging techniques may need to be used.
Originally Posted by DavidV
I checked the database settings and they all seem to be set properly. I had read somewhere on JForum's site that the "app has to be registered with Tomcat". I looked for further information, but couldn't find it.
Basically, it seems that I have to let Tomcat know to also run JForum.
JForum already ships as a webapp with the correctly configured web.xml. It cannot run as a war file.
Originally Posted by Biju
The registration of servlets is done by editing your .WAR file (or exploded .WAR file)'s WEB-INF/web.xml file, putting in the appropriate <servlet> and <servlet-mapping> tags.