Create A Connector

From the Home tab toolbar, click on the Connector button.

Click the position in the diagram where the connector starts to place the first end point, then drag and drop the mouse at the second point. When dropping the second connector point, the connection points on the symbol will appear in blue when the cursor is close to the symbol. Once a connection point turns red, releasing the mouse will attach the second end point to that connection site.

Right click or press ESC to exit connector creating mode.

Editing A Connector

Click on the line/curve of the connector to select the connector. And then:

Connector Line Style

Click on the line/curve of the connector to select the connector. Click on Line button from the Home tab toolbar. See Line Style for more information.