Seems like the site's not working OK.
Posting again:

I have VB Studio 2008 + Excel 2007 on my system. Any idea or source of
detailed info as to how to create a simple UDF like
=AddTwoNumbers(Number1,Number2) which after I create and install via an addin
would recognize the same in the excel like a native function. In other words,
I could be able to use the same in Conditional Formatting and the same
appears when I only insert an "=A" in a cell in the list of available
functions?

Have tried many sources and sites. The function is created like a simple
UDF, Auto mation AddIn but does not provide the facility of autocompletion
and / or being used in primitive features of Excel especially like
Conditional Formatting.
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Thanx & Best Regards,

Faraz!