If you look at the bottom of the page that you type your posts in you will see a tab marked up as 'Upload attachment', click on that tab then click the 'Choose File' button, select your photo by double clicking then press the 'Add The File' button and your photo will upload.
I have uploaded an example photo onto your post so you will be able to see what I have done by clicking the edit button.
Your module sounds like it is going to need replacing, a crack is not usually a good sign.