You cannot create email accounts. But you can set MX records. Since you can not create email accounts, you will need to use a external service (There are free web email services). https://infinityfree.net/support/how-to-set-your-mx-record/
You can’t create email accounts on free hosting because of spam issues. So you will have to use an external email service (Zoho and Yandex still have free tiers) or upgrade to Premium Hosting as the email functionality is still there.