Hi Bhargavi,
As far as I know, you dont have an EDIT button in GENIL_MODEL_BROWSER, it is used to view your BOL Model. To Edit a Model you have to use GENIL_MODEL_EDITOR or do it in your Model Table, and GENIL_MODEL_EDITOR is only available in SAP CRM 7.0 Ehp1 not in SAP CRM 7
Thanks and Regards
Pratheek