1. Edit plugin settings (home page, footer etc) to display the necessary information https://xstore.helpscoutdocs.com/category/112-amp-plugin
2. Sorry, don’t understand how do you try to translate the logo? Logo is the image not text to translate that. Provide screenshots for better understanding.
3. I suppose AMP extension for the W3 Total cache should be enabled if you want to display AMP version with the cache plugin.
