How to Show Blog Post and Blog Comment Post Type on Activity Page?

First, you need to enable  Blog Post and Blog Comment Post Type on Youzer Panel >> General Settings >> Wall Settings >> Scroll down until find  Control Wall Posts Visibility. And enable those types buttons.

If Blog Post and Blog Comment Post Type does not appear on your Activity Stream although you already enable it on Youzer Panel, then please go to Settings >> Buddypress.

And make sure Site Tracking settings already enabled