If you need to connect remote to a PC and download something via torrent you need to do these steps:
Install transmission-daemon:
apt-get install transmission-daemon
This will install and start the service: transmission-daemon.
If you want to check it's status you can run:
systemctl status transmission-daemon
This will start a service and a web interface to acces the torrent client. This client will be at: ip:9091/transmission.
If you open that url, it will ask a user and password, by default these are:transmission:transmission.
If you want to change something, ex: the username, password, port; you can edit the settings file: /etc/transmission-daemon/settings.json. But before stop the deamon:
systemctl stop transmission-daemon
# After edit, start the daemon
systemctl start transmission-daemon
By default the download_dir is set to /var/lib/transmission-daemon/downloads you can change it to any value.
For username and password for the web interface: rpc-username and rpc-password(put it in plain, it will be hashed automatically after daemon starts).
If you want to access this interface from remote, you can do a tunnel via ssh:
ssh -L 127.0.0.1:9091:127.0.0.1:9091 user@pc