Alright I did quick search and found this manual.
http://www.senao.com.tw/english/prod...UserManual.pdf
Now you either want 5.4.1 Special Application, or 5.4.2 Virtual Server. I'm pretty sure you want Virtual Server which is on page 20.
Under mapping ports column you would put 2234, put in your IP Address, and then check enabled.
If you don't know your IP address then you can click start, run, and type command, then type ipconfig and it will show you your IP.
*I'm not exactly sure the difference between those two, I just played around with em both untill I got emule to work.