Every post you make can have one file attached to it, which other users will be able to view. To attach a file, first open the posting form (you cannot use the Quick Reply feature). On that page you will see a field labeled "Attachment".
Click the button labeled "Browse" or "Choose" and then select the file you want to attach. Attachments can be images, documents, or archives. There is a maximum size limit, so you may get an error message if you submit a file that is too large.
Displaying an attached image in your post
To display an attached image inline in your post, you can use the [attachment] BBCode like so...
[img][attachment][/img]
[url=[attachment]][img=640x480][attachment][/img][/url]