Open an account at==>
www.photobucket.com It's free! upload your image there(try to resize it to 640pixel wide, it's better for the board) when your image is there, you're gonna see differents link to choose,,Take direct link by click on it it is automatically save in yout temp memory...after that, you make a post and click on the image button ans paste it!(with the right button on the mouse!).
Hope it help!