Orton Filter

To connect object to each other, you always drag a line from the Out socket of one object to the In socket of the another object.
To disconnect object, click on the In socket and "pull" the connection line out.
Object that is not yet correctly connected to data will show Err tag

For this example we need to have both A and B sockets of the Blend Layer connected to the main Image and the Out socket of the Blend Layer connected to the blue Output object.