Can some kind warrior please tell me what I need to do to
insert a row of 4 images into Wordpress below the header
but above the post? What code do I need to add to which
template/s to make this happen? Can it even be done?

The images are in reality different sizes but I want them to look
like they are all the same size when the page is displayed.
I don't want these images to be part of the post, I want them
to be part of the theme and to be displayed on each page/post.

Is there maybe a plugin that will do this for me?

I hope I have explained this enough for you to know what
I am on about.

Thanks in advance.

Lynette