I have learned how to post a photo but I do not know how to control the size of that photo. Most of the time I get a tiny thumb size and it is not useful. I use mostly Image Shack for hosting photos and they provide limited editing. There is a feature of the Upload Page that allows me to select a size but this has no impact on what I get even if I select a different size. I think I need to resize a photo on my computer with my software before I save it to Image Shack? But I don't know how to do that.
I use a MacBook Pro 13", two years old. Everybody said I'd be able to do things a lot easier with Mac than Windows. This has not been my experience.