You can just snap the spent flower off. I try not to remove leaves from young plants-- they are needed for growth.

Right, don't fertilize until they have recovered and have put out plenty of leaves. Bloom Buster is the wrong kind of fertilizer--regular Miracle Gro or Miracle Gro for Roses is fine, or any reasonably balanced fertilizer such as 10-10-10 or 18-6-12. Watering correctly is the most important thing. Keep a 2" mulch of leaves or bark around the roses. When the soil under the mulch feels dry-ish, water thoroughly with 2-3 gallons for small plants or 5 gallons for larger, plus or minus for extremely hot or very mild, cloudy weather. Usually once a week is fine. For new plants, I divide the ration in half and water twice a week.

Rose photos are not showing. Please try to post them again. I guessing here. Sounds like you are using one of the Bayer combo products. Many of us here do NOT recommend those 3-in-one products--often they give the rose much more than it needs. Certainly, if you were not having problems with fungus or with insects, your roses did not need an insecticide or a fungicide. And some posters have noted that the "feed" part--the fertilizer--might be too strong. I'm guessing your roses are suffering from too much nitrogen--nitrogen-burn. All you can do now is give them a good deep watering to try to wash away some of the effects of the nitrogen and then wait patiently for the rose to put out some new leaves. The other possibility that occurs to me is you have a severe spider mite problem. They are so small that you may not see them, but often there will be some telltale webs around parts of the roses. In that case, the cure is relatively easy. Use a stiff spray of water from your hose and give those roses a thorough shower, in particular spraying up underneath the leaves. Repeat this process one or more times every few days. After a week or so of such treatment, the spider mites should be gone (They hate water.). Good luck. Kate

It looks like you have a lot of dead wood that needs to be removed. Did you prune it yet this spring? Normally over the winter, some of the canes die off. The new growth looks healthy, just remove everything else.