Hesus, Welcome to the forum. It was really nice reading your thread and don't be hard on yourself. you are new to the Bird world. There are so many pure bread and hy brid Macaws in the world, so honest mistake.
The important this here is, you have your macaw home now and their life can only improve from here.
I agree with all that was said on the advise given to you, specially the diet, this is so important.
Just a couple of tips to keep your B&G happy and healthy. Ontop of a great diet, you may want to offer your B&G 1 hard boiled egg with the shell and remove the yoke. This is great for their feather, nails, and beak.
I found it much easier to buy a shower perch that has the sticky cups that you press onto the wall, place your B&G under the shower head and allow them to get used to the shower, your B&G will soon love getting shower, specially around the molting seasons.
After the shower and while your B&G is wet to the bone, apply 100% pure aloe Vera, I use from a size of a dime to a nickle. I rub the aloe into my hands, then wipe both my birds down.
I then use a hair dryer set on low and approx 36 inches away from the birds and allow them to dry.
If you live in a hot climate, the hair dryer is not needed.
Please ask as many questions on this site and you will get great advise. Best of luck Joe