The easiest way that you can do is going to user's preferences - My Preferences section. There is a checkbox section Which items do you want the dashboard to show?
From there you can check Last modified blogs
and Last modified blog posts
and uncheck the other option. This will show all updated blog and posts to your dashboard and you can easily navigate from the dashboard to the post( then answer or make a comment).
If you consider different approach, let us know.
the Telerik team