When you hit the "Upload an image" button it should take you to your Pictures files where you will select the picture you want to post. If you're posting from a tablet or your phone, I can't help you much further than that. Too many variables. If I post from my Android phone it takes me to my Gallery of pictures.
Sorry, I don't give out my e-mail address to anyone on a public forum. But to get the greatest benefit from this site you will need to learn how to post pictures anyway.