1. In Sales or Service Cloud, navigate toSetup.
2. Click Customize under Build.
3. Click Contacts.
4. Click Fields.
5. Click Email Opt Out.
6. Click Set Field-Level Security.
7. Enable Visibility for all applicable profiles.
8. Save.
9. Click Customize under Build in the Setup menu.
10. Click Leads.
11. Click Fields.
12. Click Email Opt Out.
13. Click Set Field-Level Security.
14. Enable Visibility for all applicable profiles.
15. Save.