1- Upload the plugin folder magic-answers to the /wp-content/plugins/ directory

2- Activate the plugin through the Plugins menu in WordPress
3- Go to Settings->Magic Answers Options in your WordPress Admin-Panel and save default answers for the first time (or edit them).

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That’s it! a new button will appear in your Posts/Pages editor

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and a new widget will be available in your Appearance->Widgets

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NOTE: you can also add it directly inside your template: