If you can not add server or set up runtime or get any server related errors,open the server by right clicking on it and change the port number to default(8080).You can see the added server in bottom panel. The server tab is in between 'properties' tab and 'data source explorer' tab.
You will have to download and install,
- MySQL Workbench 8.0
- Apache Tomcat v9.0
- MySQL Connector