The webinar is being presented by familytreewebinars.com.  Go to their home page and click on the Polish genealogy picture.  This may or may not get you in for today.  There is a limit of 1,000 and since it is happening today it may be closed.  The webinar should be posted to this same site by this evening and be available for 7 days for free.  You can view it 24/7 until March 2.  Please let me know if you have any further questions.