So, now you've seen how not to get results from a forum post first hand.
Now, as for your animals: You need to get that retained shed off. My advice is to consult with a veterinarian on this, and to also review husbandry if you are able to afford that. If you can't afford veterinary care for the animals, then you cannot afford to keep them. That's not an insult, it's a basic premise of keeping reptiles or any other pet for that matter.
In any event, here is a link to a page on shedding problems:
http://www.anapsid.org/shedding.html#prob
Read the part on Problem Sheds, and also read the whole article.
On the same site is a basic care sheet for leopard geckos (check out as much of the site as you care to read, it's got a lot of good information on it):
http://www.anapsid.org/lep_gek.html
OK, the other part of the shedding equation breaks down into three possibilities (and if anyone has more, please pipe in):
1. Leopard geckos need a dry setup, but they also need a humid area to retreat to, as this helps when it's time to shed. Provide a moist hide box by taking a small rubbermaid or similar container, and cutting an access hole in it about an inch or so above floor level. Fill the bottom of the box with a moist substrate. Sphagnum peat moss is a good choice, or even paper towels. Placement of the box in the cage should be on either the cool side or half on/half off the heat pad. Make sure it is always moist. Mist it daily if you have to.
2. Parasites can contribute to bad sheds. Reptiles excrete an enzyme between the old skin and the new to help loosen the old skin so that it will come off. If the animal is in poor health and unable to produce this enzyme, then this can cause a bad shed. Intestinal parasites can inhibit the animal's abilitiy to absorb the nutrients it needs to create these enzymes. You should take a fresh fecal sample to your vet to test for parasites. You can keep it fresh by placing it in a plastic bag with a damp piece of paper towel and refridgerating it until you take it to the vet.
3. Poor nutrition can contribute, so you need to make sure your animals are feeding well and properly supplemented. The caresheet above should discuss this, and more can be found by searching Google.
So, first things first:
1. Make sure you have moist hides for your animals.
2. Get fecal samples to your vet.
3. Review the information on helping get rid of that retained shed and get if off your animals.
4. Review husbandry information and make sure your setups are good.
I'll let you answer this before getting into ideas to improve setups, so you have a chance to ask specific questions, since I'm not sure how your animals are set up at the moment.