Go to Preferences -> Data Sources. In the Connections panel click the New button.
Enter a unique name for this connection and select one of the previously configured eXist data sources from the Data Source combo box.
Fill-in the Connection Details
URI to the installed eXist engine.
User name to access the eXist database engine.
Password to access the eXist database engine.
eXist organizes all documents in hierarchical collections. Collections are like directories. They are used to group related documents together. This text field allows the user to set the default collection name.
Click OK.