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

www.changeip.com

# This is configuration file for
# http://www.changeip.com/
# dynamic DNS service provider
#
# No change is needed in this file
#
# 

[default]
withpass=0
host=www.changeip.com
port=80
path=/update.asp
protocol=http

[requests]
u=%USER%
id=%HOST%
p=%PASS%
ip=%IP%
hostname=%HOST%

[result]
success=200 Successful Update
warning=
multilines=1