Rosie, on a Mac if you press 'Ctrl' on your keyboard and click with the mouse button at the same time, it is the equivalent of 'right clicking'.
Edit:
As for your images not showing up, there are only two possible explanations for it:
A) they are not uploaded (double check! I have pulled that one wayyyy too many times)
B) the path's are incorrect.
In your HTML a path will look like this:
Code:
<img alt="" src="some/image/on/computer" />
In Dreamweaver, if you added in an image that was outside of the website folder (for example, you chose an image that is in your personal 'images' folder) then the 'src' attribute for the image will be pointing to THAT directory which doesn't exist on the server (but it does on your home computer)! Best thing to do there is to make a folder inside the website folder called 'images', move your images into there then add them into your template with Dreamweaver FROM that folder.
Hope that helps.