shrug That article is somewhat helpful but honestly this isn’t going to really help transferring your data.
Simplest thing is to create an account with Dreamhost and do the one-click install of mediawiki.
Now do a mysqldump of your current database, not sure exactly what OS you are using but the simplest and most common way is to go to phpmyadmin and just use dump/backup without the create db line.
Now just login to your created Dreamhost database (example):
Then just restore the database dump (.sql file) from your local machine.
This should have you all set.
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