Use the Parse > Parse Cypher menu item to show the Parse dialog. Paste cypher statements where it says Paste Content here. Then click the Parse Cypher button. The data model information in cypher statements will be parsed to augment the current data model. To parse several cypher statements, make sure each ends in a semi-colon.
The information in each Cypher statement that can be added to the data model include Node Labels and Relationship Type, and the properties of each. After adding the information, new nodes and relationships will be layed out automatically. You can reposition them manually as you see fit.