name = input("Enter your name to start: ")
print("---Welcome to the game " + name + "---")

Run the code and see what it does.

Whereas before we'd hardwired the name into the code (written it in), we now ask the user to input the name, and the program works for anyone.

As an aside, note that we left a space after the "start: " - this just lays things out better for the user. Try removing the space to see what I mean.