Convekta now has an English website for Chessplanet. See this link for more information. Also note that people using previous versions of the program may experience connection problems. The IP address has been changed for the server (the default configuration for the newest version of the client points to the new IP).
For people using the old software, the new IP is: 22.214.171.124 But I would recommend that you update to the latest version of the client, which is available at the chessplanet website.