1. From Setup, enter Sharing Settings in the Quick Find box, then select Sharing Settings.
2. In the Account Territory Sharing Rules related list, click Edit next to the rule you want to change.
3. Change the Label and Rule Name if desired.
4. Select the sharing access settingfor users.Access SettingDescriptionPrivate(available for associated contacts,opportunities, and cases only)Users can’t view or updaterecords, unless access is granted outside of this sharing rule.Read OnlyUsers can view, but not update,records.Read/WriteUsers can view and update records.Note Contact Access is not available when the organization-wide default for contacts is set to Controlled by Parent.
5. Click Save.