uno to xively upload help

New in the ethernet world I try my first steps with a demo program xively-sensor-client.
Here is a part of the code:

#include <SPI.h>
#include <Ethernet.h>

#define APIKEY         "6bdqlXOuFxslViiNH47bHQ4BgquDNA5FhTTv6u9yTN1XXUe4" // replace your xively api key here
//#define FEEDID         "sa_CqVcUqxTaHY38NXZe" // replace your feed ID
#define FEEDID         235989283 // replace your feed ID
#define USERAGENT      "popol" // user agent is the project name

// assign a MAC address for the ethernet controller.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
// fill in your address here:
byte mac[] = { 
   0x90, 0xA2, 0xDA, 0x0D, 0xF2, 0x5C};

// fill in an available IP address on your network here,
// for manual configuration:
 IPAddress ip(10,0,1,20);
// initialize the library instance:
 EthernetClient client;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
 IPAddress server(216,52,233,122);      // numeric IP for
//char server[] = "";   // name address for xively API

unsigned long lastConnectionTime = 0;          // last time you connected to the server, in milliseconds
boolean lastConnected = false;                 // state of the connection last time through the main loop
 const unsigned long postingInterval = 10*1000; //delay between updates to

The serial display answer is:

User-Agent: popol
sensor1  79
HTTP/1.1 401 Unauthorized
Date: Thu, 22 May 2014 15:31:21 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 50
Connection: close
WWW-Authenticate: Basic realm="Web Password"
X-Request-Id: 527babf0daa9df0ff2b6e3ca5c091754da4f7ba3
Set-Cookie: _pachcore_app_session=BAh7BkkiD3Nlc3Npb25faWQGOgZFRkkiJTZkMmEyMzZiYTRlMzMwZjIwYTljNmE2ZTY3MDRhNDVlBjsAVA%3D%3D--c0753558828101d07e7876ddd16e61e83b618f33;; path=/; expires=Thu, 05-Jun-2014 15:31:21 GMT; HttpOnly

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Thanks for any information who put me on the good road.