Sony Ericsson Vivaz Galaxy: how to change apn from att media?? to straight talk

HI,
I have a new sim installed and the phone is working but I can't get the apn added to start using data.
Can anyone walk me thru how to change it?
thanks
Betty

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Try this: Go to settings > connectivity> destinations> Access point (add new)

Enter
NAME: straight talk
APN: att.mvno
PORT: 80
MMSC: http://mmsc.cingular.com
MMS PROXY: 66.209.11.33
MMS PORT: 80

You may then have to go to each of the settings (internet, multimedia msg, wap) and set the priority to straight talk from media net. To do this select options > organize > change priority for each.