First, please try rebooting your unit by shutting it down and then turning it back on.
There are many reasons you may be having problems connecting to a Wi-Fi network. Before investigating further, we recommend following these simple steps to refresh your network connection.
For KidiBuzz and KidiBuzz G2:
https://www.vtechkids.com/tutorials/kidibuzz/%7BF2583B49-2793-4028-80CF-EFBA045B516D%7D
For KidiBuzz 3:
https://www.vtechkids.com/tutorials/kidibuzz3/%7BF9FE167E-11DF-4435-A22A-50B8DB205E12%7D