# Account Registration FAQ

- [Why Does It Say “Email Already Exists” When I Try to Register?](/chang-jian-wen-ti-fan-ti-zhong-wen/chang-jian-wen-ti-english/account-registration-faq/why-does-it-say-email-already-exists-when-i-try-to-register.md)
- [How to add a referral code during registration](/chang-jian-wen-ti-fan-ti-zhong-wen/chang-jian-wen-ti-english/account-registration-faq/how-to-add-a-referral-code-during-registration.md)
- [How to find your HoyaPay ID](/chang-jian-wen-ti-fan-ti-zhong-wen/chang-jian-wen-ti-english/account-registration-faq/how-to-find-your-hoyapay-id.md)
- [How to check your registered phone number or email](/chang-jian-wen-ti-fan-ti-zhong-wen/chang-jian-wen-ti-english/account-registration-faq/how-to-check-your-registered-phone-number-or-email.md)
- [What to do if you forget the phone number or email used during registration and cannot log in](/chang-jian-wen-ti-fan-ti-zhong-wen/chang-jian-wen-ti-english/account-registration-faq/what-to-do-if-you-forget-the-phone-number-or-email-used-during-registration-and-cannot-log-in.md)