Rose Leaf Turning Brown | New Gardeners | GEEKGARDENER

Hi, Container-only-gardener here, saying hello to all. I am new to the site. I am a new gardener and I have some plants in my flat. The question I have is from my aunt who lives in Bangalore who is a keen gardener and I am helping her use this site.
Here is her question:
" My rose leaves have become brown on the edges. They were nice when I bought them. I went to the seed shop and he gave me agrozim, a fungicide powder, I believe. He said, this is very good and he gave me some green powder. He said, mix both and spray. I don't know how good it is. The gardener in our complex said that the plants need vitamins. Need some advise on this. My plants are all in containers and in the balcony of my flat. We have a lot of sunlight as well".

Also, need advise on how to paste pictures of plants to share with other keen gardeners.

Thanks
C-O-G