For easiest upload make sure the picture attachment is a .jpg format. Keep the name of the image simple and short with no out of the ordinary characters in it.
Do I upload them as I post? There isn’t a page set aside to store my pics on?
Upload them as you post. You can post quite a few each time.
Just above where your type you will see a Manage Photos button. Click that. It will open a another window where you can browse the pics on your computer, after you find the one that you want then double click on your picture. Then click update, your pic should show up in the second window. If it doesn’t most of the time your pic is too big and you might need to crop it a little.