@pratik Yeah, the documentation lags behind here. Sorry about that. The plug-in shows a fallback when things go wrong, taking the visitor to your profile on Micro.blog.
You can change both the URL and text for this fallback link from the settings. Or you can choose to not have a fallback link. In that case, when something goes wrong, there will be no link at all.
So, what can go wrong then? For example, if you, like me, have a self-hosted blog, there can be a delay between a new post being available on my site until it shows up in the timeline on Micro.blog. In that case, my plug-in won't have anywhere to send the visitor, as there's no related post on the timeline yet. So the fallback link will be shown instead. Or not, depending on your settings