Hi Molly
Thanks for writing in, and apologies that the initial instructions aren't working to install McMyAdmin. It seems to be a stumbling block for more than a few people.
I would recommend that you install homebrew - it's a package manager for the Mac that allows you to install tools and software that wasn't initially distributed by Apple. There's no risk of malware or anything nasty getting on to your computer by installing it.
Follow the instructions to install brew at
http://brew.sh (the command in the terminal is:
After you've got Homebrew installed, you can then install wget:
And that should do the trick!
Please let me know how you get on.
Code on!
Jim