How can I add a metabox to a buddypress forum post?

Hello,

I’ve installed the newest version of WP & Buddypress. Forums are activated.

Now I have a plugin which allows to add Amazon products to posts. When users create new posts a metabox with a search box appears.

Users can now search for Amazon products. A shortcode of the selected Amazon product is then added to the editor field and appears within the posting after saving. That works fine.

However, 90% of my sites discussions are not within posts, but within one of the buddypress forums. I would like to add the same metabox below the wysiwyg editor every time a user creates a new forum entry in one of the discussion groups. I tried a lot, but I can’t find the correct add_action(..) hook to show the metabox below the editor on forum pages.

Can you help me?

Thank you.

Rhodes