Lutten wrote:So, I need to upload my sql file into store folder and run the conversion? That's it?
No, you need to make sure that the IPB database (that is currently in the SQL file) is inside a database on your host. This usually means taking the .sql file and uploading it via your hosting control panel into a database you have created, via something like phpMyAdmin in your control panel. The Converter FAQ that I linked to earlier explains all of this in more detail.
Once you have done this, you'll be able to start the conversion properly.