I've noticed that quite a few people seem to have problems when it comes to including photos or screenshots into their posts so here's the PEASIEST way i've found yet.
Go to
http://tinypic.com
(You don't even need to have an account but it's dead simple to do and they never log you out either)
Just upload your image, you'll see four different codes next to it. You can view real size so if it's too big, downsize and upload again.
Copy the "IMG Code for Forums & Message Boards" and paste this directly into your post, you don't even use the "insert image" button as this code does exactly the same thing.
So, no confusing add and update attachment to do.
OK so now no excuses, get those screenshots and photos coming so we can view them directly
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Edit : However, please don't stop uploading your kitty pics to Flickr where we have the KittyCatS group with 1000s of lovely photos to browse and where we can drool and leave comments.