If you have validated your words, without the banners to the right, here, showing up with a blue ribbon WINNER badge, you did not find the button either. This morning, luckily, I checked the same website on my phone. I had thought it quite uneventful last night - no badges, bells, or whistles. The little validate button is under the window that looks like a Boones Ferry sign-in box, or old ghost town window. You have to scroll down - and even reduce the magnification of your screen content to see the button.
Now, I am a winner. Willow is ready for writing, as I was in the Pre-writing classification.