I don't actually know where the instuctions are, but I will try to help.

One way is to click on the "paper clip" above where you type in your post, then browse and select your pictures on your computer. Once you have all the pictures selected, hit "upload".

The other way that I do it is to upload my pictures on Photobucket.com and copy the direct link from the picture that you want. Then, back on the post page, click on the icon that looks like a little picture of a mountain, just below and to the right of the "paper clip". A window will pop up and you will see where to paste that direct link. I hope this helps.

Greg V