Welcome from Murrieta (near Temecula, about 20 minutes south of Riverside).
You can use a photohosting site if you want to embed full size images in your posts, like this:
Hello from the desert
You'll need to size the images correctly, as the forum doesn't resize them for you. I find that 800x600 seems to work just right for me.
You may also "attach" files diretly to your post, and insert the attachment into your text. This hosts the image directly on the site, but it doesn't appear the same way in your post and will require clicking on it in order to see it in it's true size. To do this, click on "additional options" on the lower left portion of the screen when creating a new post or reply, and browse for a file using the "attach" field. You can attach up to 9 images I think by clicking on "more attachments." To insert this attachment into your text, click on "insert attachment" next to the correct file with the cursor in the correct location within your post. It will look something like this:
[ You are not allowed to view attachments ]
Anyway, welcome and happy wheeling!