Okay, so, there should be an option in the toolbar (looks like a paperclip) that allows you to just pop a picture into your post.
http://i53.***********/11gjf3r.png
However, that uploads the picture in a miniaturised format which readers have to click on in order to expand it, which is a tragedy.
So the other way is to use an image upload site, like
Tinypic. Just upload the picture from your drive, and put the direct link* into image tags like so:
[ IMG] *picture link* [ /IMG]
(minus the spaces.)
* http://i54.***********/2jfzsds.png
And then you will have a shiny picture in your post. I recommend taking screenshots during events, adding a bunch of stuff in InsideUO, and posting the fake screenies to confuse and terrify the people.