This should have everything you need: http://support.counterparty.io/support/articles/5000003524-how-do-i-get-started-developing-on-counterparty-
counterpartyd RPC user / password: rpc / 1234
counterpartyd API Port: 4000 (testnet port is 14000)
counterblockd API Port: 4100 (testnet port is 14100)
Thank you so much. I am trying to use the API. But I have another problem. I posted an issue below.
I think that I should fix this problem at first. After the problem fixed, I will try to send my asset.
I installed counterpartyd on my own server and I could send my asset to another address by using "counterpartyd send" command.
My issue was resolved.