Nick N: We have tried to explain it in the Wilderness Permit Options page (link in the Feature Topics box above on the left). Especially read box 6, No-Fee Permit Options.
The no-show process works for BOTH overnight and Day Use permits. Only the days and times are slightly different, when the no-shows come available. If you are unsure about anything after reading that, please do ask.
Clarence: Your best chance at picking up permits is at 7 AM April 1 (Pacific Daylight time). Is that 10 AM in Ohio? If you are unsuccessful in that rush, more will come available occasionally during April as more people cancel theirs. And then on May 1, the slots from people who won, but never accepted or cancelled will come available at random times through out the day.