This goes in your \users\[name]\appdata\roaming\rabbitcoin folder:

rabbitcoin.conf (NOT rabbitcoin.txt.conf)

the config should have:

rpcuser=xxx
rpcpassword=yyy
rpcport=82555 (use 12555 for solo)
addnode=107.170.47.66
addnode=162.243.109.193
addnode=162.243.212.143
addnode=107.170.47.66
addnode=14.209.119.151
addnode=162.243.109.193
addnode=162.243.212.143
addnode=192.168.2.67:47301
addnode=79.144.111.243:17020
addnode=79.144.111.243:17021
addnode=81.151.56.206
addnode=81.190.153.234
addnode=95.39.196.210