You can get EPP code at GoDaddy either by calling them or simply following these steps:
1. Login to your GoDaddy account.
2. Go to the "Domain Settings" page.
3. Once you are there, under Additional Settings, click "Get Authorization Code".
You will get an email with your domain authorization code in just a few minutes.
All you have to do now is to enter your domain EPP code in Hostinger Domain Transfer page when prompted.
Note! Keep in mind that before transferring your domain name, you must do the following:
1. Unlock your domain name
2. Disable domain protection (you need to show WhoIs details).