Copy and paste the following line into a text file. See also this faq for information on how to use the configuration file.

cjb.net

# This is configuration file for
# http://www.cjb.net
# dynamic DNS service provider
#
# No change is needed in this file
#
# Enter hostname on program without domain name

[default]
withpass=0
host=www.cjb.net
port=80
path=/cgi-bin/dynip.cgi

[requests]
username=%HOST%
password=%PASS%
ip=%IP%

[result]
success=has been updated to point to
multilines=1
html=1