Editing Marketpress 'Store Setting' Options for Multi-site users

How do you remove the ‘General Settings’ option under the ‘Presentation’ Tab located in the ‘Store Settings’ for Marketpress. I would like to remove this option for my multi-site users when they click on the Presentation Tab. I know it’s somewhere in the code in the edit.php file but I can’t find it.

Help anyone?

Thanks,

Jafar