In your Zbattle.net Program Directory there is a file called "zbattle.net.ini"
Open this file with your favorite editor *notepad works fine"

inside you'll see something like this

code: [options]
server=iperez.ath.cx
serverport=4398
playername=
startport=4000
endport=8000
programpath=
rompath=
connectonstartup=1
[host]
playsound=0
soundfile=
playtextsound=0
textsoundfile=

change the line "server=iperez.ath.cx" to "server=www.newcon.org"

so your new file will look like

code: [options]
server=www.zbattle.net
serverport=4398
playername=
startport=4000
endport=8000
programpath=
rompath=
connectonstartup=1
[host]
playsound=0
soundfile=
playtextsound=0
textsoundfile=