A recent visitor to this blog would like to know why some of the blogs that she wanted to leave a comment on, did not give the Name/URL option. I'm mighty glad that she challenged me for an answer as it pushed me to pursue the matter at hand. Frankly, I had encountered such similar scenario and had always wondered why, but never bothered to investigate further until then.
It can be frustrating when commenting on a blog or website, and find that you're unable to link back to the desired blog of yours that has related contents.
Therefore, it is advisable to offer the complete list of identity options for commenting to your readers and reward them for visiting your blog. Anyway, it's as easy as ABC to enable it at your blog's setting.
Here's how to provide the full list of Identity Options for commenting: