Kik messanger not working for new iphone?

I just got a new iphone 5 and I downloaded kik. At first it was running smoothly then when I turned my phone off and back on to kik, I have not received any messages nor my messages sent were received. I double checked that it was not working, my sister sent me a message and nothing changed.

It needs Wi-Fi to send or receive message. Do you have Wi-Fi?