Ok, I think I see what the problem is.
The thread you're having trouble with is THIS ONE, post #7, correct?
The problem is you're posting uncompressed images that are roughly 500kb each and there is a per-post attachment total size limit of 3MB. And what you have posted now is just under the 3 MB limit.
Without knowing your computer or camera set-up, I can't advise you exactly how to compress your pics. Some cameras will allow you to select JPG output with a chosen level of compression.
Give me a few moments and I'll compress your pics for you and you'll be able to add more to that post.