Install Maven WebChat for Shopify through the Shopify app store.
Here is a link to the download page.
Complete creating your account by entering and submitting your email address, business details, and configure the look of your web chat.
Make sure you enable the web chat window to appear on your site. Simply visit the theme editor, toggle Maven WebChat on, and click save. If you would like a more detailed tutorial, you can find one here.
Once your account is created you can log into the web console where you will manage and review all your customer conversations.
Log in using the same email you registered with at https://console.mavenapp.com