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

www.opendns.com

# This is configuration file for OpenDNS:
# http://www.opendns.com/
# 
# -------------------------------------------
#             INSTALLATION:
#STEP 1:
#
#Install DynDNS Updater and choose all the default choices. After installation,
#do not choose to start the program. If it does start, exit the program completely.
#This is easily done by right clicking the checkmark icon on the taskbar and clicking
#on exit.
#
#STEP 2:
#
#Go to the location DynDNS updater was installed. This is most likely
# "C:\Program Files\DynDNS Updater\" Edit the DynDNS.ini file and add these lines:
#
#[Options]
#
#IsDynDNS=0
#
#[SvcProvider]
#
#1="dyndns.org"
#2="opendns.com"
#
#If a section already exists, for example [Options], just add the lines that are
#missing.
#
#If a SvcProvider already exists with a number 2, then use the next unused number (eg. 3)
#
#In this same directory create another file called Profile_OpenDNS.ini that contains
#the file you are now reading
#
#STEP 3:
#
#Once this is completed open the DynDNS updater program.
#
#Follow the setup wizard until you are asked to create a group.
#
#Name the group 'OpenDNS'.
#
#On the following screen enter your OpenDNS username and password and click on 'Add'
#Create an entry that matches your network label as shown and click 'OK'.
#
#Note: The hostname must match the label given to your dynamic IP network and DynDNS
#updater requires the hostname to be a proper fully qualified domain name, hence the
#network label and the hostname should be something like: mynetwork.opendns.com, it
#does not have to be an opendns.com domain. If you have a domain name you would like
#to use, feel free to do so.
#
#Once the entry is created go to the 'Options' tab. Change the Provider to
#OpenDNS and point Profile to the OpenDNS.ini file created earlier.
#Click 'Ok' to close all remaing setup screens and complete the configuration.
#
# --------------------------------------------

[default]
withpass=1
host=updates.opendns.com
port=443
path=/nic/update
protocol=https

[requests]
hostname=%HOST%
username=%USER%
password=%PASS%
myip=%IP%

[result]
multilines=0
success=good
success=nochg
warning=abuse
warning=!yours
warning=nohost