Yes you can, however, as we only offer shared hosting, it may become too much for the server and to our other clients. If this happens, we will inform you this is the case.
To set up a Multi-Wordpress site, see this tutorial
If you registered or transferred your domain with/to us, a wildcard DNS record will already exist. However, if you have a domain registered elsewhere, you'll need to add this wildcard ( * ) DNS record manually.
eg. On the DNS records on your registrar, add a wildcard subdomain that points to the your given IP. It should look like:
* A [IP]