First, ensure that the figure is specifically meant for the Apptivity WWE Rumblers game, and is not a regular Rumblers figure. You will be able to tell whether it is for Apptivity by looking for the base that the figure sits on.  Only the figures with a base will work with the game. 

Check the bottom of the base for debris, and wipe it with a clean, dry cloth.

Wipe your screen with a soft, dry cloth to ensure the best conductivity with the base.

Make sure you are holding the figure by the grips on its base in order for it to be recognized.  Do not wear gloves or mittens since the grips need to come in contact with your fingertips.

Make sure that you are not placing the figure on the frame around the iPad screen. You must keep the figure only within the active screen area.