Nope. That's way too big. It has to fit a horizontal window of 620 x 280 and jpeg files are limited to 19.5 KB (it looks like all formats are the same size).

I use PhotoShop to crop and reduce the size before posting. I'm not sure, but you might be able to use your computer's basic photo editor to do this. If you reduce the size and the file is still to big, you might have to reduce the resolution, also something I do in PhotoShop.

Let Caitlin know via private message that you are trying to post photos, so she doesn't give you the boot.