A Face can be named after 5 tiles have been unlocked, providing you own 250 or more SFT (initial purchasers are able to claim 500 SFT after purchase). If you are purchasing a Face from OpenSea or a similar marketplace, you can change the name as soon as you own 250 SFT (and the Face has at least 5 unlocked segments). Note however that Faces purchased from OpenSea or similar marketplaces may not come with the previously minted tokens.