su
yum install transmission
yum install transmission-daemon
make sure transmission-daemon service is not running
service stop transmission-daemon
edit configuration file to enable rpc and disable whitelist (or allow addresses in whitelist)
vi /var/lib/transmission/.config/transmission/settings.json
start transmission-daemon
service start transmission-daemon
Note: if you modify settings while transmission-daemon is running, changes won’t be saved! Therefore, first stop the service