Some agencies will want to specify a primary office contact. This would be a central or main contact, such as for all public inquiries, or for if there is one centralized contact who offers Support or is the Service Desk number for their agency.

To do so, first add a new contact by navigating to content and within that dropdown menu you can select add content which is where you will find the contact tab. 

Then, in the Agency Settings page, specify that contact as the Primary Contact.

The social media icons in the bottom left-hand-side, will update from that Primary Contact's social media links.

Site Settings, Agency Settings, choose a Primary Contact

Go to Site Settings, Agency Settings, and specify a desired Primary Contact from the list of available contacts

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How to add Phone numbers to Contact

If you are trying to add a phone number to your contact page make sure within the top field "Primary Phone Number Type"  make sure to add if it's an Office or Fax or Primary contact. You don't add the actually number within that field

The field below it that says "Primary Phone Number" will be where you can add the contacts actual number.

Adding a number to a contact type