If you have a domain name registered in Bluehost and wish to transfer it to Hostinger, you can obtain the EPP code by contacting them, or via the Bluerock control panel by following these steps:
Login to your Bluehost account and go to the Domain area
Click the Manage option for the domain you will transfer
Choose the Security tab
Scroll down to the Transfer Authorization / EPP Code section
Select an email address, and click Send Code
After completing these actions, you will receive an email with your domain authorization code in a few minutes. While you are there, make sure to also turn off any domain privacy protection in case you had enabled it.
If you're using the Bluehost Legacy control panel or have further questions, you can check the following guide: How to obtain a Transfer Authorization (EPP) Code from Bluehost