Message received!
Welcome to pump.io!

I'm in the mobile phone, so I'll answer you with more detail later.
For now, you may find useful the “User Documentation” in http://pumpio.readthedocs.io/en/latest/

Follow some people to receive their posts in your timeline. For example, you can go to https://identi.ca/jankusanagi and have a look to his “Meanwhile” column, he comments a lot in recent posts from many other people, so you can have a look to those posts, and follow their authors.