Adding Another User to db.ini

I would like to give another person FTP access so that they can utilize the Dropbox plugin. I know I have to add the account that I set up for them to the db.ini file, but I am unsure of how to modify the file to add a second username and password. Is this a possibility? If not, is there anything else that I can do so that this person can have a way to dump files easily all at once onto the site?

db.ini is only relevant for the MySQL database access, so the only info there is for the MySQL user.

FTP access is about users with access to files on the server. The server admin should be able to set that up. Or, if you are on a hosted system like BlueHost or DreamHost, you should be able to create the user and assign permissions via their admin interface.