These two pages seem relevant somehow:
http://www.zenfolio.com/us/z/help/support-center#/customer/en/portal/articles/408314-image-resolution
http://www.zenfolio.com/us/z/help/support-center#/customer/en/portal/articles/408312-display-images-sizes
The first one sure does make it seem like you can upload full-resolution files.
When you posted this question, I didn't realise you were talking about the same website. I assumed people would be viewing the photos on your website, and telling you which ones they'd like to order; then you would prepare those photos in high-resolution (at 11:15) and email them to them.
But was I wrong about that?
Remember how you found this? The bolded part is really important. These sizes are for online presentation only. They're MUCH too small to be downloaded and printed.
At this point in the thread, we were just discussing how to put your photos on your website for people to view them. At least, that's what I thought we were discussing.
Then let's start again. This is REALLY important, because it's catastrophic if you get it wrong.
I'm going back to read the thread again from the start, so I can get my head straight.
Elements is awesome. Persevere with it, because you'll be AMAZED at how good your photos can be.
Start here: https://www.damiensymonds.net/trainingialm.html
Not crazy at all. Thousands and thousands of people make the same mistake as you. Apple are great at marketing, not so great at making screens.
Edit on the 24" one, and use the 27" one for panels, email, etc.
Hi Karen, is the 24" one running from the 27" computer? It's not attached to a different computer?
This is very common, I'm afraid, and pretty much un-fix-able when you have poor-quality screens like these. Which Spyder do you have?