Picture Posting tutorial...

[L78M22Rag]

I'm trying to learn how to post photos to the site. When I used the "Manage Attachments" function and tried to upload my photo, it gave me the message
"The Dimension limits for this filetype are 1500 x 2500. We were unable to resize your file so you will need to do so manually and upload it again. Your file is currently 4032 x 3024."

I've seen references to clicking on a certain box, but my screen looks different. When the site was updated, I recall getting a message asking whether I wanted to view the site in the new format or the old... not being good with change, I chose the old. Could it be that I need to change my view to the new format? If so... how?

Thanks guys.