Found it in the readme file in the plugin directory… Hopefully, this is somewhere more conspicuous and I just missed it otherwise this should be added somewhere easier to find.
Plugin Support
Temyk
(@webtemyk)
Hello.
In the FAQ of the plugin:
The snippet code executed with an error and I cannot change it, what should I do?
Do not despair! Even an experienced person can make mistakes. We created a secure mode for this case. Go into it and your snippets code will not be executed.
Go to the safe mode by this link: http://your-site-name.dev/wp-admin/?wbcr-php-snippets-safe-mode
Edit the snippet in which you made a mistake;
Leave safe mode by clicking the link: http://your-site-name.dev/wp-admin/?wbcr-php-snippets-disable-safe-mode
Plugin Support
Temyk
(@webtemyk)
The content of the readme file is displayed on the plugin page in the WordPress repository
Glad I was just missing it 🙂