From the Main Menu, select ‘Freeze’. Next, select ‘Starting Steps’ then select ‘Bubble Guppies Theme Song’. Dance through the song. This song’s dance moves are very simplistic and you really should have no problem getting three Gold Stars on this song. When the freeze moves appear (there’s three of them), you receive as many stars as you do for freezing, so if you receive two Freeze Stars, you get two stars towards your Gold Stars progress. Try to get all three Freeze Stars all three times you can. It will help.
It’s best that you don’t use the chair method to unlock this achievement because even if you play the same song twice or more, chances are you’ll end up with a different amount of Gold Stars earned.