name='Windthrop']First - become a registered user - easy
Second - click on help in the IMDB page and look at the adding info link - that is very informative.
I submitted a TV production which had not been inlcuded and existed in an image and a few lines on a web page. The URL was useful in providing evidence - which was limited to some of the cast/date/TV company and title and original dramatist. That got accepted so it seems that you can provide some evidence that the item actually existed it will be accepted.