From where? You have a Disney resort booked? If so, and you click on "MagicBands and Cards" in
MDE on the website, it should take you to the order page. Do you have a screenshot of where you are trying to access it from?
Nope, they are already linked since you ordered them with a resort stay. And bands are never linked to a "trip", they are linked to an individual profile. Then they work for all purposes, for all trips.
You are correct, even when solid colors were still complimentary, if you included any paid bands in your order, they were shipped shortly after payment.