Change the link to the presentation after importing

I have inherited a captivate project that was built by a former coworker.  It is linked to a ppt that includes a date.  I would like to update the name & location of the ppt. and have the captivate file point to it.  I have read the article "Change the link to the presentation after importing", which tells me I should be able to update  to a different powerpoint, but there is not way to enter the new ppt's URL.  Any hints?