This is probably a connection issue; maybe you're seeing the message "Oops. This is taking longer than usual. Please try again."
To login and use Kik, you need a good Wi-Fi or data connection.
Here are a couple things you can try:
Toggle your connections off and on in your phone settingsSwitch to Wi-Fi by disabling your data connection in your device SettingsSwitch to your data connection by disabling Wi-Fi in your device SettingsMove to a different Wi-Fi network, like free Wi-Fi at a coffee shop or libraryForce close the app and re-open it