To visualize your data on the knowledge graph, you need to choose what data you’d like to convert to tables first by creating the relationships. Once this is done, click the graph tab. This will load the whole graph with each node and relationship.
Clicking on any node and then "Focus on node" will enable you to visualize the relationships for that particular node.
You can create your own relationships between nodes by clicking on the node, selecting "Create Relationship" and then dragging to the second node to connect it to.