No problem. We've all done it. I know I have.

For the site to host pics, they need to be less than 1500 pixels on the longest side and just a bit less than 1meg in size. You can get free picture resizing apps for your phone, but of you use Tapatalk to access the forum form your phone, then that should also offer resizing on the fly (or so I'm led to believe as I don't use it).