Re: a few set-up questions
1. When you are logged in as a moderator or above (admin or keymaster), at the bottom of the topic, you will see “[Stick topic (to front)]” – there are two links there. Stick topic just sticks it in that forum. To front sticks it to the front page.
2. You need a plugin for that.
Old:
https://bbpress.org/plugins/topic/allow-images/
Newer and different:
https://bbpress.org/plugins/topic/bb-attachments/
3. Did you activate them in the admin? Or, what version bbPress are you using? I’m not sure it was included in the earlier versions, so those early version required a plugin. It’s built in now (in the 1.0 alpha releases anyway.)