If you are not connected to the internet, you won't get any updates in the d!NK app.
Step1: Go to settings of your tablet:
Step2: Press the tab Wi-Fi:
and slide the Wi-Fi to "ON"
Step3: Choose a Network and fill in the password, than press joint to connect.
If you are connected but still don't have access to the internet. You might try to restart the tablet.
If it doesn't work, we can only redirect you to Apple's insider topic about this problem.