Go to your bus, talk to the computer to the left, Hibiki will ask you how you want to find your character, select by team and then pick aphrodite's team. If he doesn't show up on the firs result, retry until he is available. After you "bought" him, you have to walk out of the bus and walk around for a while, until hibiki phones you and tells you to go to a certain area, the one Coco said.