You can get EPP code at BlueHost by contacting them or following these steps:
Login to your BlueHost account.
Go to the Domain Manager page.
Select the relevant domain name.
Unlock the domain via the Lock menu.
Turn off privacy via the Privacy menu.
Select the Transfer EPP option to obtain your Auth code.
Completing these actions you will receive an email with your domain authorization code in just a few minutes. Now you will be able to transfer your domain to Hostinger :)
NOTE: You can also check this article for more information about the EPP code.