An EPP code is an authorization key provided by your old registrar and required by your new registrar to complete a registration transfer for a domain name. You must contact the old registrar to obtain this.
If we are your registrar, you can get your EPP code by submitting a ticket to request that it be provided to you.
All domain management is coordinated by the Internet Corporation for Assigned Names and Numbers (ICANN), and specific rules are in place for transferring domains between registrars. These are viewable at ICAAN's site (this external link will open in a new tab):
These rules state that the EPP code may be sent only to the email address listed in the publicly-available WHOIS record for that domain.
Per Section 2.1.3 in the document above, authorization can only be given by the Administrative Contact (termed by ICANN the "Transfer Contact") and requires:
"Consent from an individual or entity that has an email address matching the Transfer Contact email address."
Please make sure your WHOIS information is correct and publicly available in order for your request to succeed.