Type your Nimbuzz id without @nimbuzz.com on the "User Jid" tab and type your password on the "password" tab. it's not necessary to fill the "Resource" tab,keep it empty and click connect.once you have successfully connected to the server you will get a message window ,saying you are successfully connected.if not you may done a mistake.
copy XML scripts on the empty tabs below the connect buttons and click on "send".
Thanks to the Programmers Asi Firtina and Pesimist_61x
Download the XML sender from HERE
NOTE : if Application not working,try update . Net framework to latest version.