How to do this?

Question

Write an external Javascript program taht will adds up integers that the user enters. First the program ask how many numbers will be added up. Then the program promp. Then the prompt the user for each number. Finally,  it prints the sum. Use the prompt method for inputs and alert method for output. The program should immediately start once you load the HTML document in a browser. Use for loop.

Answer 1

The description explains everything:
1. Prompt the user for the number of numbers
2. Do a for loop with this quantity
3. Prompt the user for each number for the sum
4. Sum the numbers
5. Output the sum
Which are exactly your difficulties?

Answer 2

Don't wait for someone who will give you a well executed code just start with your knowledge on coding whenever you stuck attempt your code here ask your doubt here where you're doing wrong/different logic for my code so anyone can help you along with your code..
Happy Learning

Thank you !!