Your FTP details can be easily found by opening Hosting → Manage:
And scrolling down to FTP Accounts section:
There you will be able to see your FTP details:
FTP password is not displayed in the control panel due to security reasons. By default, your FTP password is the same as your Hostinger account’s password. If you are using Social login method you will need to set the password through FTP Accounts → Change account password in order to start using FTP.
FTP password also applies for SSH connections.