Asp.net and DotNetNuke do not allow you to include a FORM in your DNN page. There are things you can do. See How to Include Multiple Forms in DotNetNuke.

For Paypal, the easiest thing to do is use a link instead of a form. Go into Paypal, Merchant Services and create a Buy Now button. Then click the Email tab and you will see the linking code. Put that code around a Buy Now button and you are all set.

<a target="_blank" href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=11112222"><img src="https://www.paypal.com/en_US/i/btn/btn_buynow_SM.gif" border="0" alt="YOUR PRODUCT NAME AND KEYWORDS"></a>

By Andrew Weitzen, Bronze Inc.(c) 2010

Bronze is the publisher of several online Internet journals including: InternetHandholding.com, DomainNames.gs, DotNetNuke.bz, Programmer.bz, Software.vg, WebHosting.vg