It is daunting the first time you do it, isn't it?
First thing, you have to upload the picture from your computer to a photo hosting sight. Many of us use Photobucket.
Once that's done, copy the
[IMG] [ /IMG] codes and everything in between. Come over here to the Forum and paste it in your message.
Let me know if you need screen shots.
You can do it!!
ON EDIT: For instance, if you use Photobucket, hover your mouse over the picture you want to copy. You'll see something like this:
See where it says IMG CODE? You want to copy everything in that line to the right. That's what you paste over here. If you have grabbed the [IMG] codes correctly, you will NOT need to click on "Img" here in the Forum. You only need ONE set of [IMG] [ /IMG] codes.