You will find the extra fuse inside the connector. One of the fuses will already bee connected.
If you wish to extend the LED rope longer please follow the instructions below.
Locate the end connector of the rope you wish to extend. You will want to loosen the locking tab and remove the end cap to expose the female connector.
Now grab the other rope light you wish to connect to the first rope. You will now need to remove the front end of the rope, which will be the whole connector. You can remove the front end the same way you would remove the end cap. Start by loosening the locking tab and you will be able to pull it out and expose the male connector.
Now you will want to connect the two ropes together and tighten the locking cap on the two ropes. You are now ready to plug the rope in.