Just a few things before you get started:

• be sure you dont put in the http:// of your forum link or any thing else like / \ : * ? < > |
  
• Adresse du forum=your forum link
  
• then click on: "Valider" which means validate
  

Link to create this: http://illiweb.com/ForumActif/afficherPage.php

When you get the script; you must copy it fully and then, you go to:

Admin Panel
Portal
Portal structure
Create a custom block

You need to paste the script after you clicked on the A/A icon. Put this block in the 2nd column