How to upgrade on FreeNas

Hallo,
I googled quite a bit but could not find any instructions on how to upgrade Subsonic from 6.0 to 6.1 on my FreeNas box. Anyone can help me with this? Thanks a lot!
I googled quite a bit but could not find any instructions on how to upgrade Subsonic from 6.0 to 6.1 on my FreeNas box. Anyone can help me with this? Thanks a lot!