Instructions
Pop each bubble in the level up until you reach the steed. Move behind the queen to find a hidden bubble to pop. This bubble contains a tail that will automatically be added to your inventory when popped.
Open your items menu by pressing the Square button.
Press the left arrow to access the ̶0;Stickers and Decorations̶1; sub-menu and hit ̶0;X.̶1; Select ̶0;Decorations̶1; and use your arrow keys to highlight the tail. Hit ̶0;X̶1; to equip the tail.
Move your left cursor onto the dot on the hindquarters of the steed. Wait until the dot glows green and hit ̶0;X̶1; to add the tail to the steed.
Jump onto the steed to prompt it to roll and continue on with the stage.