有人知道登陆界面的姓名怎么改掉吗？

我一直用的iCloud密码，没有password hint，不过可以参照苹果官网的步骤：Add or change someone else’s password hint:
An administrator may add a hint or reset the password of other users.
1. Choose Apple menu > System Preferences, then click Users & Groups.
2. Click the lock icon to unlock it, then enter an administrator name and password.
3. Select a user, then click Reset Password.
4. Enter and verify a new password for the user, enter a password hint, then click Reset Password.

改自己的：
Add or change your password hint
Choose Apple menu > System Preferences, then click Users & Groups.
Click Change Password.
Enter your existing password in Old password, enter and verify a new password, then enter a password hint.
Click Change Password.