Summarize this article:

Jellyfish do well in dark environments. Make sure you place the tank on a flat, raised spot in your home or office that does not get direct sunlight and is not near any heat sources or electrical equipment. A low table in your home in a dark spot or the top of a desk would work. You could also get a small raised wooden stand for your home or office and place the tank on top of that. Connect the filter plates together and place the air tube in the center of the filter plates. Depending on which filter plates you buy, they may come in several small parts or one to two larger parts. You want the air tube to be in the middle of the tank so it can circulate air throughout the tank.  You may need to trim off one side of one of the plates to make it fit with the rest of the plates. You can do this using scissors or an X-ACTO knife. Place the filter plate and the air tube in the tank. The plates should cover the bottom of the tank and fit snugly when you slide it into the tank. Substrate is going to help to hide the filter plates in the tank. You should use glass beads, rather than sand or gravel. Gravel can be a hazard for your jellyfish. Place the beads into the tank by hand so they do not break or nick the tank. Look for glass beads at your local dollar store or online. Glass beads that are the size of jelly beans are ideal substrate for your tank. You should fill the tank with at least one layer of substrate, or 2 inches of glass beads for a medium sized tank. Once the substrate is in the tank, you can connect the air tube to the air pump. Do this by using the airline tubing. Place the airline tubing into the air tube so it is dangling a few inches into the tube. Then, connect the airline tubing to the air pump. This will allow you to cycle through air into the tank using the air pump.

Summary:
Find a flat, raised spot that does not get direct sunlight. Set up the filter plate and air tube. Put in the substrate. Connect the air tube to the air pump.