We'll take our quick-release skewer. Remove the nut and one spring. Go ahead and take the quick release skewer now and slide it through the hub, the hollow axle of the hub of the front wheel. Put the spring back on side, it's conical. Put the narrow end of the cone first towards the center of the wheel. Reattach the nut. Just a few turns. You want that nice and loose. You'll see the quick release skewer is now inserted into the hub. You can lift the bike up, set the fork down onto the two ends of the axle.