Help don't have an "install zip from sdcard" option

I'm completely new to this; it feels like I'm missing something obvious. I'm attempting to set up CM9 using the instructions in the "CM9 for your Touchpad" sticky post and ACMEInstaller3. The installation worked fine right up to the instruction for Google apps.

The problem I'm having is that the "install zip from sdcard" instruction doesn't appear. I can get to the moboot 0.3.5 menu, which includes the options boot webOS, boot CyanogenMod, boot webOS Recovery, reboot, and shutdown. If I choose "reboot," it brings me directly back to this menu. If I choose "webOS Recovery," it goes into USB mode, and I'm stuck. What am I missing?