Ok there are a couple of ways of uploading pictures.
1.If you already have a photobucket of flickr of vimeo account or whatever you can right click your image and copy the link location. Then the next step is to do your post find the button at the top of your post collumn there should be a bunch of gray buttons. You will want to find the button next to the flash and chainlink button which has a picture of a little tree. Click the tree button then paste your image inside of the box it brings up then hit ok and you have succesfully put up an image.
2.Then next option is to host an image. To do this you want to hit the button next to the tree button which has a tree with a floppy disk next to it. Then you want to browse the images you have on your computer. Then you will want to select the image you will be using and then you will want to hit the button that says resize image and then click host and you are done.