you can't load up pictures from your hard drive into this forum.
They have to be uploaded to the internet first, which means you need webspace for it.
Many providers offer this, also Yahoo, but not all work for posting it somewhere.
have a look at FAQ, here everything is explained.
To make it easy:
you need to type this and in between without space the address of the picture.
The address of the picture you will get by doing a right click on the picture and a window wil appear, choose preferences (last one below) and anothjer window will open. here you will find the address (URL). Copy the full address and paste it in between the .
It doesn't work with some services like Yahoo, etc, if you have stored a picture there.