There are two places that we specify IP addresses in Contour.  The first is during the setup process, where you told Contour where your SQL server was located. If you used "localhost" then you don't have to change anything (assuming your SQL server is still on the same machine as Contour).  If you do need to change it you can do so in your properties file:  %CONTOUR_HOME%/database.properties (database.url line).

The other place you may need to change your settings would be the SMPT server.  You can find these settings under the root admin, System Properties tab.