You can add images by uploading them to the wordpress library and then switching out the exiting images. This can be done using the pop up menu for each image, or sometimes on the right hand menu, depending on the style template and theme you choose.

Gotta
Content here should be typical of the layout that you are using

Catch
It could be an image caption or comment, or show the source of the image

’em
Or you can use hyperlinks to go to new pages or blogs