there is no function wfLoadExtensions() my wiki crashed when I copied and pasted the code into LocalSettings.php

Yes there is, but that is not how to call it - https://github.com/wikimedia/mediawiki/blob/master/includes/GlobalFunctions.php#L53-L72

Change 492483 had a related patch set uploaded (by Reedy; owner: Reedy):
[mediawiki/extensions/WikiEditor@master] Update README

https://gerrit.wikimedia.org/r/492483

Hello Reedy,

Got it, thank you. But then the README still contains an error on line 8. The first argument to the function should be a single element array not a string.

Ingo---

In T216889#4978316, @Ingoschmied wrote:

Got it, thank you. But then the README still contains an error on line 8. The first argument to the function should be a single element array not a string.

Yup, which is why I didn't close your bug as invalid, and I fixed it in the patch that was posted

My first time doing anything in Phabricator, just set up my first wiki using MediaWiki…total noob. Thanks for your help, take care!

Change 492483 merged by jenkins-bot:
[mediawiki/extensions/WikiEditor@master] Update README

https://gerrit.wikimedia.org/r/492483