Access an existing view for editing

Hello – I’m trying to find and pull up an exiting view for editing in GM.  The view list does not display any views at all for update.  I’m a member of the of the GM admin group and was able to create a role,  the view, and assign the view to the newly created role.  User can access the view without problems, but I need to modify the view a little more.  How can this be done?  Thanks in advance.