234187 Data Entry - Copy & Paste URLs

Hi, I administer a WordPress blog. I need someone to log into the admin area of this blog and to edit previously made comments that are missing a URL in the URL field. I need a URL added to every comment that is missing a URL. I estimate that I have a total of 1300 comments, but my best guess is that about 60% of these do not have URLs, but I am not positive. If my estimate is correct, then I will need around 800 comments edited. I will provide you with instructions on how to locate the comments in the WP admin, how to edit the comments, and the URLs I wanted added.