Bulldogs World

WHen I click below on the insert image, it doesn't work.  When I use the little picture icon above, it doesn't work.  Ugh!  Could someone please walk me through it.  I know I have posted pictures before; I'm not sure what I am doing wrong.  I am able to upload the picture, but when I click 'insert file" nothing.  I have also tried doing it with Flicker...no luck.  

DO I need to resize my photos?  I am using a Mac if that matters.