Sorry for being vague. I don't understand the technical issues just yet, but my webhost uses cpanel, and it enforces a prefix on database names of the client's username. I tried to create database with a name appropriate under those restrictions, and then I tried to import the backup using phpmyadimn, but that gives me the following error:
-- Database: `oldhostusername_bulletin`
CREATE DATABASE `oldhostusername_bulletin` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;
#1044 - Access denied for user 'newhostusername'@'localhost' to database 'oldhostusername_bulletin'
Apparently, the import does not give me an option to choose which database to but the backup sql data into, and instead tries to put it into whatever db is hardcoded into the backup from the old web host.
So, I tried to create a db with the name "oldhostusername_bulletin", but the new host cpanel only allows "newhostusername_bulletin". After that, I gave up, since I don't know what else to do.