There's no hosting account attached to the forum account you are posting from. The request would need to come from the linked account.
If you don't know what the linked forum account is, login to your account at
https://x10hosting.com/sso/login, then once you are logged into cPanelclick "Support" -> "Visit Forums". This will reveal the autoamtically created and linked forum account, password for that would be the same as you use to login to the account.