1. Search Setup for Custom Metadata Types.
2. On the All Custom Metadata Types page, click Manage Records next to the custom metadata type for which you want to add or modify records..
3. On the list of custom metadata records, click New, or clickEdit to modify an existing custom metadata record.
4. Fill out the fields. The Protected Component checkbox determines whether the record is protected. A protected record is only accessible to code in the same namespace as either the record or its associated custom metadata type: code you create, code in an unmanaged package, and code in the same managed package as either the protected record or its custom metadata type.
5. Click Save.