There is not any option to add your friend at KidsZone whereas, you can play FunZone with one of your friend one by one. 

Only single kid can access KidsZone at a time, although during a puzzle or while accessing FunZone kid can add his/her friend and play together.

For Example: While playing a game called Tic Tac Toe you need 2 players, you can play with your friends on 1 screen. 

Click on the following link to go directly to the Tic Tac Toe FunZone: www.mindstick.com/KidsZone/Home/TicTacToe