Deluge is a lightweight, Free Software, cross-platform BitTorrent client.
Once you've enabled it in your account, launch the app via your dashboard.
The default credentials are:
delugeThe default Deluge instance is restricted to whitelisted-only, private trackers. You can request a private tracker be whitelisted, by creating a support ticket.
If you require public tracker access, there's a dedicated delugepublic app available, which is slower, but unrestricted in terms of public/private trackers.