vpn configuration?

settings->vpn is where you enable and disable it

settings->general->vpn is where you add the vpn settings for your network

What kind of VPN is it? PPTP, L2TP, IPSEC?

Is this for your work? (If so, ask the IT department)

I've put up an article on this topic that I hope will help others:

see Setting Up an iOS 7 On-Demand VPN