I have tried doing that but I get "unknown command"

Make sure you start the daemon from a command prompt within the directory where fantomcoin resides.
In Windows 10, hold 'shift' while right clicking the folder: 'open command window here'.
fantomcoind --add-peer
Here are my current connections:
print_cn
2016-Oct-24 08:41:22.537664 Connections:
Remote Host Peer id Recv/Sent (inactive,sec) State Livetime(seconds)
[OUT]144.76.72.6:24080 e86512c62b7a36b3 9884164(18)/174818(12) state_synchronizing 828
[OUT]176.9.147.178:8280 3bb4a4737743d368 8950063(9)/142553(10) state_idle 816
[OUT]176.9.34.167:24080 e86512c62b7a36b3 8112020(10)/122242(11) state_synchronizing 829
[OUT]188.0.42.57:24080 262d4ce25271cdff 11259934(9)/162302(11) state_synchronizing 822
[OUT]195.154.181.121:828025b43e21597ed730 10235737(9)/147115(11) state_synchronizing 810
[OUT]178.63.62.93:24080 6fce0dc5d630d4c2 9397809(9)/243309(11) state_synchronizing 828