Seems my image is too big and wattos's forum won't allow me to upload it.
I have a free Weebly website that I use for uploading screenshots. I'm able to make a thumbnail by uploading 2 of the same picture...then resizing one of them down to thumbnail size on Weebly. So, it takes 2 pictures...a regular sized one and a thumbnail to use this code...
[url=http://link.to.your.fullsized.image][img]http://link.to.your.thumbnail.image[/img][/url]
If something like that isn't an option, I think this website is pretty popular for uploading photos to, and it gives you a thumbnail link...
https://www.scrot.moe/I have to say this though...I don't know if it was due to me signing up with that site or if it was coincidence, but a couple of days after joining that site, I started getting TONS of SPAM in my email.