My Knowlage of PHP is = 0

My Elgg is 1.8.2

My level of English is about 7 of 10 .

My request: I would like to introduce a banner at the right side of one of the pages of my net. I.E. in Activity page.

url of banner = "http://www.addressofmybanner.com"

I would like to know step by step how to do it.

Hope anyone can reply it. 

Thanks in advance.