I have an iPhone and this is the way I do it:
1. Download the app Picup (the icon is a picture of a cloud with a smiley face on it.
2. Follow instructions for app (very simple)
3. Open the picture you want with safari (it's under remote location)
4. Copy the URL from the safari browser
5. Open tinypic and use the URL option so I can paste the URL you copied
6. Pick desired size and click upload.
You can use whatever uploading site you want but I like tinypic because they have a message board size option