You must install the dictionary file created during the Font Editor session in /usr/lib/mle/zh_TW/eucinput.usr to make the new characters accessible by Chinese input methods.
Normally you must be superuser to install such a feature. If you do not have superuser privileges on your system, contact your system administrator for help.
To install the dictionary file, become superuser and type the following command:
system% su # cp /tmp/newfont/eucinput.usr /usr/lib/mle/zh_TW