Strangly French carier name Colis Privé is not selectable - how to add?

[Mark1988]

Dear,

We are shipping to French with carrier Colis Privé, which is one of the bigger and wellknown shipping carriers in French, and is known among Amazon, CDiscount & other Logistic Providers. Only we noticed that Colis Privé is not selectable as a carrier name when marking the Shopify order as Shipped.

Same time we understand that other partners of our fulfilment center also ship with Colis Privé and are able to select this in Shopify.

Does anyone know how we can add this Carrier (name)?