I pressed "continue" but was asked to log in again. Then my changes were gone!
You are automatically logged out after 30 minutes.
If you're not clicking on links, MOCpages doesn't know you're there.... that means
If you spend more than 30 minutes on a single page (such as spending a long time creating a new page) you will be automatically logged out.
In this case, an easy fix is to make sure you preview your page every now and then (perhaps every 15 minutes) by pressing "continue", and then going back to edit.
Pressing "continue" tells MOCpages you're still there.
Or you can write about your creation in a text editor or word processor before coming to MOCpages, and then copy>paste what you wrote into your web browser when you create your page.