If he is useless, as long as you change the password and stop trading, you will be fine. The only worry is that if you don't change your password, your friends will use this account in the future. If the loss is too great, the debt exceeds the money in the account, and he doesn't fill it for you, then you risk being recovered by the futures company. 500 thousand yuan is just the threshold for opening an account. As long as you open an account, there will be no capital restrictions, and you can trade more than100,000 yuan. If your friend doesn't do it, you can ask him to take all the money left in the account, and you can log in and check it yourself. As long as you don't owe money to the futures company, you can modify the password, save the account number and password, and stop trading. It doesn't matter whether to cancel or not. There will be no other charges.