面板找了半天，好像没这个选项。
好像只能命令
/usr/local/lsws/admin/misc/admpass.sh
Please specify the user name of administrator.
This is the user name required to login the administration Web interface.
User name [admin]: u4v.cn #用户名
Please specify the administrator's password.
This is the password required to login the administration Web interface.
Password: #密码
Retype password: #重新输入密码
Administrator's username/password is updated successfully!