You can use this conlib control to have product tell a friend functionality as a popup. There is one important thing which is if you have popup control on you page then you can't have standard product tell a friend control on same page. When you place this control in product details page it will just render a link "Send Product". When you click this link it will open a popup.
The control exposes two settings
LinkCaption through which you can change the text of
Send Product link and other is
PopupCaption through which you can change the header of popup. In order to use control where you want popup functionality just put following code in scriptlet