If you send traffic directly to your affiliate link you will not be able to see any stats other than how many people created accounts on the webinar page (in the referrals section)
If you want to see visit stats, opt in %, and other data you'll need the ROI Panel click tracker. (income stream #3)
If you have an ROI Panel account and you use a tracking link it will tell you how many opt ins you received from the traffic you got and also who many created accounts.
If you do not use ROI Panel, you can only see how many visitors created and registered accounts in your back office after you log in at the bottom (under the referrals section)