can you help with mms and web browsing on iphone 3gs using straight talk?

im trying to activate mms and web browsing on my iphone 3gs. i am using straight talk sim card and they gave me the info to put as the apn and stuff, i just dont know where to put them. the values from straight talk are:

name- Straight talk

APN- sap.tracfone

proxy- "leave blank"

port-8080

mmsc- http://mms.tracfone.com

mms proxy- "leave blank"

mms port- "leave blank"

the only one i dont really know where to put would be the port number, 8080 because theres no spot for it under the network setting. please help

ps. op system version is 6.1.3

and its unlocked