Upload fields in the admin

Hello again,

How do I add an upload field in the admin so my client can pick and choose the image he wants to use on a certain page? I've managed to create basic forms for text fields in the blueprints, but can't figure out image uploads.

Any help would be greatly appreciated, thanks.

There is no upload field currently other than the one we use below the content area. This is a special case though for adding page media.