The “-“ combines “move” and “turtles” into a single name. Earlier, we used red - 2, with spaces, in order to subtract two numbers, but here we want move-turtles, without spaces. Note there are no spaces around the hyphen in move-turtles. The “Disable until ticks start” prevents you from pressing go before setup. The “Forever” checkbox makes the button stay down once pressed, so its commands run over and over again, not just once.
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