steps for configuring FTP with Proftpd
After installing Webmin on a VPS, you may be wondering how to add and configure FTP users. With Webmin it is not a one-click process, but the procedure is still fairly simple. To install proftpd and add a user, follow these steps:
Login to webmin at http://xx.xx.xx.xx:10000 (may be https:// for Debian/Ubuntu system)
Access the Webmin Modules option via Webmin > Webmin Configuration
Select Standard module from www.webmin.com
Click the button on the right of that option
Click Install Module
On the left sidebar, after installation, click Refresh Modules
Click Create a new user accessed via System > Users and Groups
Provide a username for what is to be your FTP account
Select Normal Password and provide a unique, complex password for the account
If desired, select a custom home directory, otherwise choose Create home directory near the bottom of the options.
Select New Group with same name as user
Once this is done, you should be able to access FTP with the username and password you selected, using your server's IP address as the host.