I am trying to learn what is correct way of adding signatures while posting questions or replies on this new community site.
Thanks in advance.
Discourse, which is the software we use on this site, doesn’t have that “feature” on purpose, because it makes reading threads more difficult, and promotes spammy behaviours.
Adding a signature manually in every post is also discouraged.
The closest thing you can do is keep that sort of information in your profile so that people can see it when they click on your username. I see you have already added this.