If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Make the dancers the color they're suppose to be and try to complete as many dances as possible.
Remember the color codes on the grid to make the dancers dance to the song.
Press "A" to choose red, "S" to choose green, and "D" to choose blue.
Once the color is selected, click the dancers in each grid to color them accordingly.