2) Choose how should the formatting of the external source look. It includes a Condition by default.
3) Once you choose an option and click OK, the external source placeholder will be added to your template.
4) What content will later be displayed can be set in the Company profile where you assign the specific external source.
Please find a live guide under this link.
If you're not happy with the predefined options, please let us know at firstname.lastname@example.org and we will be happy to come up with a more elaborate result.