I was looking at the 5-step instructions for the pedalSHIELD, and they don't specify where the 4.7uf and the 1uf capacitor go. The 10uf and 47uf capacitors are shown rather obviously because of their sizes, but the other two appear identical to me, and so I have no idea where to place either of them. If someone could clarify this for me, that would be great.

4.7uf is near J1 (input jack) and 1 uf is near J2 (output jack). Négatives pin are in the center of the board. For the value and the pinout, it's on the capacitor.

Yes Vice is right, from the Bill of Materials:
- 1u --> C13
- 4.7u --> C3