Thank you for help
But still cannot start transmission.service 
I Use this guide 
http://archlinuxarm.org/support/guides/ ... ansmission & 
https://wiki.archlinux.org/index.php/Transmission[pi@alarmpi ~]$ sudo systemctl enable transmissiond.service
Failed to issue method call: No such file or directory
[pi@alarmpi ~]$ sudo systemctl enable transmission.service
[pi@alarmpi ~]$ sudo systemctl start transmission.service
Job failed. See system journal and 'systemctl status' for details.
[pi@alarmpi ~]$ sudo systemctl status transmission.service
transmission.service - Transmission Bit Torrent Daemon
          Loaded: loaded (/etc/systemd/system/transmission.service; enabled)
          Active: failed (Result: exit-code) since Sat, 22 Sep 2012 21:56:47 +0100; 7s ago
         Process: 525 ExecStart=/usr/bin/transmission-daemon --pid-file /run/transmission/transmission.pid (code=exited, status=217/USER)
          CGroup: name=systemd:/system/transmission.service
Sep 22 21:56:47 alarmpi systemd[525]: Failed at step USER spawning /usr/bin...ss
[pi@alarmpi ~]$