If you added a datasource you don't want to use any longer, you can easily delete it.
To delete a datasource:
From the Explorer Runtime tab select the Installed Servers node, iPlanet Application Server 6.0 node, the Data Sources node, then the datasource node of the datasource you wish to delete.
Right-click on the Data Source node and click Delete.
When prompted, confirm that you wish to delete the datasource.