laravel-vue-i18n language change via website

Hello, I'm trying to learn Laravel and vue, and now I'm looking at this package for translate, I installed it, it works, but I don't understand how to change the language though website? I created several json with languages, and if I change the language in the config, everything changes and work. But how can I change the language through the site and save it? Thank you! Im use this package - laravel-vue-i18n import { loadLanguageAsync } from 'laravel-vue-i18n';

This code should be used to change the language, but I don't understand how to use it {{ $t('Welcome!') }} <button @click="loadLanguageAsync('pt')">Change to Portuguese Language