S2 Motion paths - how to see, how to speed

I successfully applied curve motion paths to some pictures. How can I:
1. See them so that I can make some adjustments? I was able to see and adjust when I drew it, but now I want to make another adjustment and cannot see the path to edit.

2. Can I control the speed? For example, I have the user throwing a dart yet it moves like a crawling snail..... ;-)

thanks!

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