We have PhpMyAdmin available on every server.
You need to know the name of the server your shop is hosted on. If you lost it, contact us.
The URL of PhpMyAdmin is:
You can use the same login details Magento uses to access the database. If you lost them contact us.
The database user is the same as the SSH/SFTP user of the hosting account.
If you try a wrong password too often, your IP will be blocked from access. If you need to be unblocked contact us.
You can create extra databases, as long as you start the name with the username and then an underscore, for example myuser_extradb.