allow CKFinder file uploads

I would like to enable the 'Upload' tab shown in http://www.youtube.com/watch?v=uixf-jwt5t4
when clicking the link button

I notice in includes/ckeditor.lib.inc there is an if statement around what potentially might be the section that might cause the Upload Tab to appear

However, it calls on a permission that is not in hook_permissions: if (user_access('allow CKFinder file uploads')) {

filebrowserBrowseUrl
filebrowserFileBrowseUrl

How can I enable the upload tab?

Thanks
Audrey