After restoring FTP server in High Sierra, how to log in to localhost?

I followed the instructions here https://apple.stackexchange.com/a/312273/72004 to get an FTP server running on High Sierra. But when I log in to localhost, it doesn't recognize me as a user. % ftp localhost Trying ::1... Connected to localhost. 220 ::1 FTP server (tnftpd 20100324) ready. Name (localhost:[my username]): [my username] 530 Login incorrect. ftp: Login failed What gives? How can I restore myself as an FTP user? Thanks!