If you require something or if something is required, you need it or it is necessary. If you require further information, you should consult the registrar. This isn't the kind of crisis that requires us to drop everything else. If a law or rule requires you to do something, you have to do it.

What does they would require meaning?

To have as a requisite or necessity; need or depend on: Do you require assistance?

Does required mean must?

to place under an obligation or necessity: The situation requires me to take immediate action. ... to demand; impose obligation: to do as the law requires.