To point your Hosted~FTP~ account to ftp.yourdomain.com, you need to login to your webhosting c-panel dashboard (the domain hosting your website).
From there, create a CNAME record pointing ftp.yourdomain.com to ftp.hostedftp.com or company.hostedftp.com. Then under the branding section in your Setup tab, input the new hostname under Server.
I.E. in this image, you should point the CNAME record “ftp.yourcompany.com” to “ftp.hostedftp.com” or “hftptutorial.hostedftp.com”
This will allow your users to use a more branded hostname when connecting to your Hosted~FTP~ server.