Index.php(Miniportal)

Hello My internet friends. I must be the most inquisitive person in this forum.
Now i have used the miniportal integrating my forum with my own website.
I folowed the instructions that required me to rename index.php to forum.php
and copy some given code and and call it index.php I did exactly that but when i ran this
index.php, its not displaying anything other than a blank page.

What should i do?