Do I select different template before send message? If so how can I?

Yes, you can select a different template each time before sending a reminder message. Log in as the account owner. From your Shopify admin, go to Apps > Whatsapp Chat Support Share. Find  from the top and click on it. Search for the name or user from the list and then select a template from the popup window. After then click one the send action button to send a message.

Do I select different template before send message?