Basically wondering how your able to upload an image. I have a great Haul of stuff i purchased today that i wanted to show off.
Switch to the advanced editing feature. There are tools for uploading images and files as attachments.
The easiest way is for you to change your option in your User Control Panel to Enhanced Interface - Wysiwyg Editing under miscellaneous options section. Once you've done that, then when you post, you will automatically get the advanced editing screen.
Up to you, but I would recommend using the forum gallery. With the gallery, that image will always be easily accessible to you for future posts. Once uploaded, you just copy and paste the link it returns, into any post. Gallery instructions here.