You need to put the "grumpycoin.conf" file on the correct folder. Go to the first post of this thread, copy the content, paste on a software like notepad and save the file on the correct folder for your Operational System:

Linux    
$HOME/.grumpycoin/    or /home//.grumpycoin/grumpycoin.conf

Mac    
/Users//Library/Application Support/Grumpycoin/grumpycoin.conf

Windows

XP -- C:\Documents and Settings\\Application Data\Grumpycoin\grumpycoin.conf
Vista, 7 -- C:\Users\\AppData\Roaming\Grumpycoin\grumpycoin.conf