To be able to export or import a database to the server you need first to create folders where to export and from where to import db.For me, it is the same folder... Create a folder in the desired...
DataBase category
Edit database with just FTP
If you just have a FTP and want to edit, backup or import database it is pretty hard to do that with just FTP. But if you download phpMyAdmin and upload it to the root folder of the site you have...