Although you cannot actually delete a TurboTax account, you can always choose which account you have created to use. Simply use our account recovery tool to look up your account (particularly if both are created under the same email address) and chose which one you want to use. Be sure to follow the below steps carefully.
https://myturbotax.intuit.com/account-recovery/
Also, if you need to delete data within one account and start in another, please use the steps in our FAQ below.
https://ttlc.intuit.com/replies/4248526
Let us know if this does work.