the attachement tool in the forum works wells, but needs pictures of a reasonable size.
When you take pictures with your camera, the result is HUGE files, not adapted for internet showing.
you have to use a tool (supplied with your camera, or you computer system, like paint, gimp, etc...) to reduce the size (in pixels) of your picture.
If you can't find a software like this, you'll find plenty on the internet
try to reduce your pics at least between 500 an 1000px width : so people with tiny screens and/or low bandwidht internet acces will be able to see your work