Data not working on Lumia Icon - Need Help With Quick Access Settings (AT&T)

[SaadYo]

Hi, I just purchased the lumia icon verizon and I'm hoping to use it on ATT's network. Text, Phone, works but no data

I have downloaded access settings but have no idea what I should enter for:

APN
User name:
Password:
Authenthication Type: pap or chap?
Proxy Server URL
Proxy Port
Network Type:

Then....

MMS access point name
username
password
proxy address
proxy port
mmsc address
network type
authentication type:

PLEASE HELPP!!! rly: