QUOTE
What would be the cheapest and shortest way to do that from within FrontPage
You can't. FrontPage is a tool for designing web pages.
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Something like adding some Codes to my site or whateva
You can't just add some codes to the website, because the website wouldn't know what to do with the code. Just grabbing a random example off the web, you would start out with an HTML forms something like this:
CODE
<html><body>
<h4>Tizag Art Supply Order Form</h4>
<form action="process.php" method="post">
<select name="item">
<option>Paint</option>
<option>Brushes</option>
<option>Erasers</option>
</select>
Quantity: <input name="quantity" type="text" />
<input type="submit" />
</form>
</body></html>
When the form is filled in and the user hits the submit button, the information in the form is sent back to the server. In this case, it is sending the information to a file called 'process.php'. The .php file looks like this:
CODE
<?php
$quantity = $_POST['quantity'];
$item = $_POST['item'];
?>
The .php script then gets the information from the form, and stores it in the form of a couple of variables. Presumably at this point, another .php application would take that information and do something with it, such as add the information to a shopping cart, or something else.
In order for this set up to work, the server needs to be able to run .php.
QUOTE
Just Suggestions
I asked you what you were trying to accomplish, so that we could give you sensible suggestions. We also have no idea what sort of setup your web hosting service has, so it is a bit pointless to make any suggestions without knowing that also.