VI54

Hi. I am running a mac with the latest version of OS, mamp, processwire. I have installed and created an admin user, I am 100% sure my username and password is correct. Yet when I type in my username and password: nothing happens The error is: 404 on POST http://localhost:8888/processwire/ on my mamp folder i have downloaded all files from the zip and placed them in the root. Respecting the files and folder of the zip. I am very unsure what to do.