Like ol' med said, those dry amendments take some time to break down. You could put 1/4 cup of both the 4-4-4 and flower girl into a 5 gal bucket with 4 gallons of water. Add some castings if you have them. Bubble it for a day or so with a cheap air pump and stone for a fish tank.
The dr earth has microbes embedded in the granules that you can activate a little quicker. When you pull the air stone out and you see a mucus film on the stone, it's ready. Just water as usual, or use it to water in 1/2 cup of top dressed flower girl. The microbes in the brewed tea will go to work a lot faster making those snackey cakes ready for the ladies. (Sorry, just watched biodome with the wife)
Since you already bought the dr earth, I think you would be doing yourself a disservice by not at least considering a sip. I just built 2 more yesterday, super easy. It's like an autocorrect for anything you could think of, aside from mites. Fuck mites
Just so you are aware. A year from now you will be in your garden and think, at what point did it begin to get like this? Surrounded by plants, buckets, gizmos, bags of random crap, junk in a tote you "might need for the next grow". Today, right now was that point. Welcome to the

academy