Scroll down to use the text editor to start a topic (aka thread). Give it a descriptive title and some tags.
Write your topic in the edit pane.
Attach files: Media files can’t be inserted in the text but can be attached to a topic or reply. Scroll down to the Attachments section below the text editor. Click the Browse button and select a file on your computer. You can attach up to ten files to a topic or reply, but you must attach them one at a time using the “Add another file” link. Allowed attachment file types (max size 4MB):