If it's on your SD card then just take it out and pop it into your laptop/computer. Open the SD card folder up and locate the picture, then use an image-sharing website to upload it onto the internet. (get the image, save it onto your computer from the SD card)
Right click the image once it's in your browser, click "Copy image URL" then paste it in between these two [IMG$] (paste the url here) [/IMG$] (Remember to remove the dollar signs)