Metafield for image in navigation (pages)

Go to the page in the Shopify Admin

For example: Contact Us https://bio-sculpture-usa.myshopify.com/admin/pages/84529774797

You will see a tab called METAFIELDS

Click SHOW ALL

The you will see 'Image for Nav Bar' metafield

In the dark gray box, click that and you can upload the image you want specified to show under the page in the navigation.