Were you able to get the JDBC driver installed that was noted in the article you referenced? What is the error you are getting? Connecting to data sources (of all kinds) can seem finicky because they are very specific to all the parts in place. In general, correct driver for data source installed and recognized by the system, getting the client to "see" that data source, and providing the correct connection string (providing expected parameters, and user/pwd info),
Perhaps also check out the driver noted in this other thread here:
Other options for visualization: Graph Visualization Tools - Developer Guides
Best wishes.