Does iPhone 5 still have edge?

I have a limited amount of data for LTE and 3g cause I share it with my family. I used to use edge to save up a ton of money. Is there still such a thing on the iPhone 5? If so how do I turn it on.

Yes, but depending on your wireless service you may not be able to turn it on
CDMA wireless companies (sprint, verizon, virign mobile, etc) don't support edge
AT&T and T-Mobile do, but generally only switch to edge when out of range of 3g/4g towers
you don't normally get charged more for using higher-speed data connections.

Yes it is still available. Thing is though when the iPhone finds a faster form of internet, usually 3G/4G it would use that rather than EDGE. You could turn off the 3G though.

Settings > General > Cellular > Enable 3G > Switch to off.