My foot straps are missing!

If you have MB2, it's ok, they are just hiding! You should find the foot strap tucked into the bars themselves. Just pop the end plugs off the bars and there they'll be!

If you are using pocket monkii, you don't even need separate straps (which is why they aren't included). You just slide the handle up the webbing out of the way, and slide your foot into the loop left behind. 
This should help: Pocket Monkii Instructions