You cannot get email hosting on the free hosting plan, even though the website says so. That was part of the old hosting panel which is no longer available, as we are transitioning everyone to the new panel. Once the transition is complete, the website will be updated.
With domain hosting, you can get a free subdomain, or point your own domain via name servers or CNAME record. You can get a free domain if you don't already have one at https://freenom.com
In the mean time, you can check out premium hosting for your email needs at https://www.hostinger.com/special/000webhost