How to get ftp username, password…
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Check out this tutorial for information on how to setup Filezilla to use SFTP:
How To Use Filezilla to Transfer and Manage Files Securely on your VPS
The TL;DR version of it is that you should use SFTP to connect. Set the port to 22, and your username and password will be the same ones you use to log into your droplet.
Please use SSH/SCP/SFTP/rsync-over-ssh instead of FTP: http://www.43folders.com/2008/07/14/dump-ftp