Upload the images on imgur.com or any similar websites. I don't know what wallet are you using but here's the tutorial by Shorena for signing messages in various wallets --> https://bitcointalk.org/index.php?topic=990345.msg10775516#msg10775516. You might want to use the correct format of reporting as well --> https://bitcointalk.org/index.php?topic=260073.msg2774678#msg2774678.