The page is available only when the LiveEdit plugin is installed and enabled. The plugin is not bundled with RubyMine, but it can be installed from the JetBrains plugin repository as described in Managing Plugins.
Update Node.js application on change
Update application in Chrome on changes in
Select this checkbox to enable on-the-fly preview of HTML and CSS.
Specify the time-delay between changing the code in the editor and showing this change in the browser: accept the default value
Highlight current element in browser on caret change
When this checkbox is selected, the current element is highlighted when you move the cursor. Otherwise, during a debugging session, you have to hold Shift and click the element to highlight.
Restart if hotswap fails
Use JetBrains IDE Support extension for debugging and Live Edit
If you select this checkbox, you need to install and activate the JetBrains Chrome Extension as described in Installing the JetBrains Chrome Extension and Activating, de-activating, and uninstalling JetBrains Chrome extension.