No problem, yeah I would recommend only inserting your URL in the designated field, you can always use your name as your keyword phrase, however some blog owners don't like this, and might delete your comment.
Overall, look what over people are doing, if all the comments on that particular post are an actual name, use yours or a fake one, if you see people using keywords, or keyword phrases as names, do it, or even inserting achor text in the comment section. It all depends on the blog owner and various spam addons they have installed.