Hi early learning17, I've replied to your message already, but in case others are looking for the same setting I'm posting the steps here too:
(These steps should work for all browsers, including Safari in iPad / iPhone and the Little Reader Touch app's forum page)
1. Visit the BrillKids Forum and sign in to your account. Find any thread where you've posted previously, then click on your Screen Name or the "View Profile" icon just below your avatar
2. You'll be taken to your Forum Profile page -- click on "Look and Layout Preferences" from the left-hand menu, under the Modify Profile section
3. You should see a page showing some layout options -- tick the box for "Show most recent posts at the top" and any other option you want to enable, then click on the "Change profile" button
I attached screenshots for Steps 2 and 3 for your reference.
Once you're done, check any thread and you should see that your preferences have been applied successfully.