How do I pass the price and description to the PayPal Buy Now button

[MemMakers]

I have generated the following Buy Now button. This leads to a PayPal payment form in which the user has to type in the description and price per item. I added the hidden field for the amount and currency but the amount does not appear in the form. I would also like to pass the description through.

Do I need to generate the button again? Any help would be appreciated.

Spoiler

 <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top" style="margin-bottom:20px">
<input...



https://www.paypalobjects.com/en_GB/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="PayPal ...
https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1">
</form>