How to post photo's?

[5th Tuition]

I feel quite stupid. I've been trying to post photo's for the last 40 minutes

1 I took photo's with my iphone
2 I emailed the photo's to my email address
3 I saved the photo's to my desktop (pc not a mac)
4 I open CBA websight
5 I go to the thread I want and click on "Reply"
6 I type in my message
7 I go to "manage attachment"
8 I go to browse
9 I type in the name of the photo I saved in my desktop
10 I hit "download"
11 It comes up photo too large

So I go back and try to find a program on my computer to downsize the photo. I found a "paint" program that let's me resize, but it either is always too big, or tiny, tiny, tiny
WTHell