To use this plugin, you must first enable adding IDs to elements in your app, you do this at:
Settings > General > Expose the option to add an ID attribute to HTML elements
Example of how to add action to a button: 1. Add an ID to the input field you want to focus. 2. Add a button, double click button and click "Edit workflow" 3. Add the action "Focus input" 4. Add the ID of the input field, and choose options