You need to ask the advice of anyone under the age of twelve..
It takes many years of finely honed skills to even try and understand the intricacies of posting pictures, or take the quick way and ask a kid..!!
I use a third party site to host some uploaded pics such as Photobucket. I stick some on there, and then paste the link on their site to the post on here, basically.
There are other ways, too.
Someone with brains will be along shortly..
