Pictures are easy.
You sign up with a storage location like photobucket where you can store your pictures for free. Then you go there and copy the link they provide you with the IMG codes attached to it. When you are posting a thread here, you simply paste that code into your thread as if it was so much text. Instead of seeing your text code, people will see the picture. This is a picture that I took while on vacation, call that holiday if you are in the UK. It is a young harbor seal that I came across on the beach one evening.
If you want to see what I actually posted, you can right click the image and review the image info that will give you the real location of the picture. I have nothing bigger than my avatar actually posted here on TFF. Everything else I post in the way of pictures is nothing more than a link to my photobucket account.