your picture first must be updated into the "mystical imaginary internet world", 'else-we-cant-see-it-bro!
goto deviantart.com, they treat their biatches (me and soon to be you) goood. register there and look for the submit button and use the common sense you posess and reading skills and click away, :btu:
once uploaded to deviant art's "mystical imaginary internet world" database, they like to show you a thumbnail after. make sure you click on it and see the actual sized picture. right-click on that bad boy and copy the address.
in here, paste the address and put [/img] at the end, and [img] at the start.