Is this any good for gardens as you have not mentioned it?
Horse manure is great for gardens. Here is more information: https://www.gardeningknowhow.com/composting/manures/the-benefits-of-manure-in-your-garden.htm
The burlap bag I had horse manure in, from last year, hanging in a barrel with water to make a tea, burst. I now have a manure sludge. How can I use this? Use it as it is, or spread it out on a tarp and let it dry out?
You might be better off allowing it to dry out on a tarp as you suggested and then spreading it throughout the garden.
I have been offered some goat manure and want to use it. Does it have to go through a process before using?
Using goat manure in the garden is a great idea and will help the soil considerably. You may want to compost it before you spread it to reduce the smell, but other than the smell, you can use it directly. Here is more information on using this type of manure: https://www.gardeningknowhow.com/composting/manures/goat-manure-fertilizer.htm
I have planted a very young vegetable garden. I hear manure is a good fertilazier for it. How should I use it? Should it be on top of the soil, mixed with soil then put on plants, or leave the manure as is and put under the soil? Thanks.
Manure is great for the soil and plants and there are many types of manure that you can use so finding it shouldn't be difficult. It is normally best to let it age some before use to prevent burning plant roots, as most types are high in nitrogen. You can also mix it in with compost. The manure can then be mixed into the planting soil. Here is more information: https://www.gardeningknowhow.com/composting/manures/the-benefits-of-manure-in-your-garden.htm
Where can I buy chicken manure in the Denver, Colorado?
If you know someone with chickens, this is a great way to acquire the product--not only does it help out the chicken owner but it helps you as well. Many garden supply centers or agricultural suppliers (feed, manure, farming items, etc.) sell chicken manure by the bag. You could begin with a local search for suppliers in your area. In addition, here is an article that you may find helpful: https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm
ace hardware carries chicken manure if you're local store doesn't have it in stock you can order online for in store pick-up
Two years ago my husband filled a large can with llama poo and water. He put a lid on it and forgot it. Can I use this in my garden now that it has steeped for two years, or should I throw it in the woods?
It can't hurt to use it. The nutrients make have broken down and be too far gone, but they may not. There is nothing that is in it that will harm you plants and can only help your plants.
I am trying to find an organic way to lower soil ph rapidly.
This article should help you with that: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/lower-acid-soil.htm