The solution is (using filezilla)
- Go to: / js / mage / adminhtml / wysiwyg / tiny_mce / plugins / magentowidget
- Copy the file to the desktop: editor_plugin.js
- Go to: / js / mage / adminhtml / wysiwyg / tiny_mce / plugins /
- Create a directory called: magentotypo
- Paste the file into the directory magentotypo: editor_plugin.js