Well at least you tried. I had my DIL do mine for me. Someone posted these instructions and this is what she followed.
Pictures
1.New Post
2.Put in title, add your text
3.Add tags if you want, go down just a bit more to "additional options". There is a blue box that reads "manage attachments" click on that.
4.A pop up comes up and you click on "choose file" find the file on your computer and when it shows up, click upload, then close the window.
Someone else has listed all the file sizes for different picture formats but I didn't save them, maybe someone else bookmarked them. Good luck and keep trying!