In Wiki Server 4 on OS X Server the first page includes four images that link to other pages. How do i add more?
Apparently you can... 

Upload any image using the Add image (not the attachment) button in edit mode.
Once uploaded. While still in edit mode. Click on the same line right "before" the image, not on the image itself... in the white space.

A new button will appear in the edit toolbar at the top it will say Link (down arrow).

Click that... it works just like normal links, and you can link that photo anywhere.

Click Save... now when you click the image... instead of getting another window with the preview... you get redirected to the URL you provided.