Hi Lilian,
If you look at the Navigation/Menu bar at the top, you will see "FREE DOWNLOADS", and one of the items is English Downloads / Powerpoint Slideshows. Click on that, and you will come to this page:
http://forum.brillkids.com/downloads/?cat=65Just click on ADD DOWNLOAD to add your PPT downloads.
Alternatively (I only just noticed!), do you see your welcome box at the top left of the screen, under the menu bar, where it should say "Hello MIP1999"? There is a "Add a Download" link there, and you can just click on that and select Powerpoint.