Topic: Commenting on an image

So I am trying to comment on an image and I am slightly confused on how
to do this. I am very new to Ruby so I don't know what to display for
you guys but I will show you.

I just need the method as I can't figure that out.

This is what I am trying to do.

shared/_comment.html.erb uses a method display_name.  The object
comment.commentator will be an instance of Reader which will need to be
modified to
have this method, which will be their first name and last name
concatenated together.

I want to be able to comment on an image and for it to display their

Thanks in advance