Hi Sheema,
You can rename it using mscrm translations.
check this http://www.magnetismsolutions.com/blog/11-11-28/Modifying_Translations_in_Dynamics_CRM_2011.aspx
Hope it helps.
If you find this post helpful then please "Vote as Helpful" and "Mark As Answer". Thanks and Regards, Mohammad Yusuf Ansari http://microxrm.blogspot.in