To locate the IMAP/POP and SMTP configuration of your email account you need to:
1. Access your cPanel and go to Email Accounts under Email section:
There, locate the email account you are going to connect and click on Connect Devices:
Under Mail Client Manual Settings you will find the IMAP/POP and SMTP Configuration:
You can also use your domain name as your hostname if your domain is pointing to Hostinger. You can check it in your DNS Zone Editor.