Proftpd won't says I'm using the wrong login for FTP connection
I have a droplet, and I have a registered domain name that I transferred the DNS to digital ocean. All that appears to by okay.
I can log in to digitalocean, and I can log into my Ubuntu control panel using root as a username and a separately created password.
I've installed the proftpd file transfer program and reset the conf file using my registered domain name uncommented the default user according to instructions.
Now when I open a browser and for to ftp://mydomainname.com I get a login screen from the proftpd program. I've tried entering my digitalocean password and my Ubuntu username "root" and password but the proftpd login screen is telling my that my authentication has failed.
What do I need to do, please.