0. Install the Google Chrome extension 'ChatGPT Plugin Store Searchable', or use the Tampermonkey script with the same name.
1. Open ChatGPT, select the GPT-4 model, and choose the Plugins mode.
2. Click the dropdown arrow to open the installed plugins list, scroll down to the bottom and click on 'Plugin Store'.
3. Open the ChatGPT Plugin Store, enter 'A+European Train', click on search, and find 'A+European Train' in the plugin list.
4. Click the 'Install' button to install 'A+European Train'.
5. Click the dropdown arrow to open the installed plugins list, find 'A+European Train', and choose it to enable.
6. The image below shows the interface display effect after a certain plugin has been enabled.
7. Enter 'How to use this plugin?' in the chat input box.
Use the 'A+European Train' plugin according to the usage instructions returned by ChatGPT.