I need to insert this form: http://sp8.info/form.php
into my homepage: http://sp8.info

Any ideas?

first url is not working. anyways you may upload the file on your server. then link to it from any place you like.

The page on which you wish the other page displayed must be a parsed page (php ).

Then you simply insert the following code where you want the other page to appear:

include ("form.php");

If including it in an html portion (not between the php tags), do it in this format:

 
<?PHP include ("form.php"); ?>

That will work.. You may have problems with session vars though. So be careful with how you handle your info.