????? Surely you'll see the cumulative distance? Are you saying that you want the device to beep once for 1 mile, twice for two and so on? Seriously? How hard is it to keep track of the number of miles your are running or look at the watch?
What I believe you're looking for is auto lap after a certain distance; in this case 1 mile.
In the activity, long press the left middle button. Go to "xxxxx Settings" (first one). Scroll down to "Auto Lap" and set it to on, then set your preferred distance. This will alert you to each mile passed.