Log into your NAS as administrator and go to Main Menu → Package Center → Settings and set Trust Level to Any publisher.
Then, go to Beta tab, and tick "Yes,beta versions!".
In the Package Sources tab, click Add, type Zappiti as Name and http://using.zappiti.com/synology/ as Location and then press OK to validate.
For Beta, use : http://using.zappiti.com/synology/beta as Location.
For an optimal configuration, we strongly advise you to configure your firewall.
Control Panel -> Security -> Firewall
We'll create 2 rules (Source Port/Destination Port) on the LAN network.
Go back to the Package Center and enjoy Zappiti's packages in the Community tab.
Select Zappiti Server, then Install.
Step 5 : Select Zappiti Server for Synology and enjoy Zappiti !
The name of your Server will be the same as your NAS. For example ZAPPITI-NAS, or DISKSTATION...