Click "Forget password?" on the login page.
Input your E-mail address and click "send". Please check in your mailbox for the verification code. Click "next" after filling in the verification code you received.
Please note: Before entering the E-mail address, please make sure it is already registered on KuCoin. The verification code is valid for 10 minutes.
Now you can set a new login password. Please make sure the password is complicated enough and saved properly.