Click New on the Connection menu.

Select Informix.

Connection name: assign a name.
Server: enter the name of the Informix Server.
Host: assign the name of the machine on which the Informix server resides.
Note! It depends on your Informix configuration if this setting is required or not.
Protocol: Assign the network protocol.
Note! It depends on your Informix configuration if this setting is required or not.
Service: Assign the entry in
the /etc/services or master NIS file (On Windows NT, the services file
is located in C:\winnt40\system32\drivers\etc) for
the port that Informix listens on. This can also be the port# for the
service name, such as 1526.
Note: Edit your /etc/services or master NIS file so that it contains a
line like this: turbo 1526/tcp.
Note! It depends on your Informix configuration if this setting is required
or not.
Database: enter the database name.
Database Locale: Specify the language, territory, and code set that the Informix server needs to interpret locale-sensitive data types.
Note! It depends on your Informix configuration if this setting is required or not.
User: enter the user id
Password: enter the database password
SQL dialect: define which Informix SQL dialect to use. That should be consistent with the Informix version of your database.
Enable Offline mode: Learn more here
Select User Groups who can view the Connection: Assign user groups with privileges to open objects from this connection.
Click Ok to establish the connection.
Important!
For full functionality it is recommended that the IBM © Informix Client 3 driver is installed on your system.
Please download and install from here:
http://www.dbxtra.com/Download/Drivers/IBM Informix Client 3.zip
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