Christopher,
Yes, adding /wp-admin to the homepage URL did the trick. Thanks.
WordPress files are in Applications > MAMP > htdocs > wordpresstest.
I am guessing that the website is in wordpresstest > wp-content > themes> twentysixteen (twentysixteen being the theme that I installed).
I am very new to all this and really appreciate the help.
Sincerely,
Herb
