I'm assuming you're talking about version 0.2 of this plugin.
If that is correct, have you actually bothered looking at the contents of the tc_emacs-0.2.tar.gz file offered for download? Besides the .jar file it contains a README that clearly has installation instructions:
Install gnuserv. You can download it from
http://meltin.net/hacks/emacs/ or just use a package if your GNU/Linux
distribution provides one. The gnuserv must be working before
launching the Arena. The easiest way is to put
(gnuserv-start)
in your .emacs file. The gnuserv will then be started together with
Emacs.
Make sure that you have Emacs/W3 Browser installed in Emacs. You can
check it by typing `M-x w3 '.
Put topcoder.el and TCEmacs.jar in some directory. The topcoder.el
file should be loaded before using Emacs in the Arena. You can do that
by typing `M-x load-library /path/to/topcoder.el ' or you
can just place
(load-library "/path/to/topcoder.el")
or, to load the file only when it is needed:
(autoload 'topcoder-set-problem "/path/to/topcoder.el")
in your .emacs file. I had some problems with autoloading, though. The
keymap in the TopCoder mode did not sometimes work and I had to reload
topcoder.el manually.
Make a work directory and set the topcoder-directory variable to its
name. By default it points to a directory named topcoder in your home
directory.
Launch the Arena applet and choose Options/Editor/Add. Type in a name
(e.g. Emacs), TCEmacs as the entry point and a path to the TCEmacs.jar
file in the ClassPath field.
Now choose a problem to solve. If everything went fine, you should see
two new Emacs windows, one with a problem statement and the second one
with a source code template.
