If it's like the other CF forks I've assembled, including two BMC SLR01s, it's a press fit. What I do is rig up a two by four horizontally, bevel it's edges to match the crown under the steerer, pad it with a folded up rag, rest the fork crown on that, use a piece of PC pipe that fits over the steerer and onto the crown race, then tap it home with a mallet.

FWIW: It's not actually a race, but a bearing seat. Technically, a race is what the balls in a ball bearing assembly ride on. The balls "race" around it.