unable to install Z-Space Upload Quotas plugin


I am trying to install the Z-Space Upload Quotas plugin (http://www.wpmudev.org/project/Z-Space-Upload-Quotas) - and the instructions say "Call zspace_details() from the wp-admin/index.php file (ideally under the _e('Latest Activity') line)." - well I do not see any _e lines ay all in the wp-admin/index,php file?

Where do I make these changes to enable to plugin?

I need this (and not the supporter) plugin - so I can manually manage individual blog quotas (whereas they will not be using a supporter plugin to 'upgrade' to more space - but instead I have a separate set of criteria to manually add more upload space to a site.

Thanks in advance,