Here are some hints for one possible way to write the code:

1. Create variables Heads, Tails, Total to keep track of the number of heads, tails and total tosses, and initialize these variables.
2. Create a custom TossCoin block that simulates a coin being tossed (by rapidly switching between the "Heads" and "Tails" costumes a few times before randomly settling on a choice), and updates the variables accordingly.
3. Ask the user how many times they wish to toss the coin, and repeat the simulation that many times.
4. Play the "Pop" sound that signals the end of a flip.
5. Add a brief pause between each toss so the user can see what's happening. (But make sure to eliminate this pause when simulating 100's of coin tosses.)