First turn your hub around so you're looking at the side where the cables go in.

Near the yellow cable sockets on the back of the hub you should see a small hole with the name Reset printed above it. Inside is a small pinhole.

Put a pen or pencil in the pinhole reset button for sixty seconds. This will factory reset the hub to its default values.

Once the reset is complete you can use the original passwords from under the hub, or from the pullout tab at the base of the hub.