Is your PageName going to be the URL? Or is it a custom Page name?
If it's the URL, you can create a data element from the Core > Page Info data element type, then choose "URL".
If it's the Page name, then I assume that you also have that page name being used with your regular Adobe Analytics tracking. Check the Adobe Analytics extension's Global Variables settings to see what has been set in the Page name field, and you can use that with this DCM Floodlight tag.