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Yes, it is a great amendment to add to your soil in the spring or fall, prior to planting.

https://www.gardeningknowhow.com/composting/manures/the-benefits-of-manure-in-your-garden.htm

I would contact the place from which you purchased the product. They will be able to assist you with any problems with products that they have.

Your bag of manure will give instructions such as "add a 1-inch layer of manure to top of soil and work in."

https://www.gardeningknowhow.com/composting/manures/the-benefits-of-manure-in-your-garden.htm

https://agrilifeextension.tamu.edu/library/gardening/fertilizing/

We don't make vendor or product recommendations. We do provide free how-to gardening information.

https://www.gardeningknowhow.com/composting/manures/bat-guano-fertilizer.htm

I am sure an Internet search will help you find what you need.

Generally, it is best to remove the mulch, apply composted manure, then apply the previous mulch, or new mulch. However, it will not hurt to put it on top of the old mulch. It will destroy the look of the mulch, but it will not harm a thing.

This article will explain some of the benefits of using composted manure:

https://www.gardeningknowhow.com/composting/manures/the-benefits-of-manure-in-your-garden.htm

Yes, it is safe to use mushroom manure that has turned yellow/green from sitting in the sun in a plastic bag. The change in color is likely due to exposure to sunlight and does not indicate any harmful effects. However, it is always a good idea to inspect the manure for any signs of mold or unusual odors before using it.