How to use the "Bestest Markdown Editor" correctly, I hope to get help.

[qizai123]

Good examples of plugins through Git, but I don't seem to know how to use them correctly, I hope I can get help.

Current version: redmine 3.4.6
Plugin installed: Redmine Preview PDF

problem:
     Installation process: cd plugins/ , git clone ... , restart apache, found "Bestest Markdown Editor" in the new plugin bar, changed from Textile to MarkDown by setting. But did not achieve the effect of the example.

I have two questions:
     After I cloned it locally, I found that it contained a "download-easymde.sh" script. Should I execute this script?
     Redmine supports Textile and MarkDown by default. After installing Bestest Markdown Editor, how can I tell if I am using Bestest Markdown Editor instead of the default MarkDown?