Send a message on Mattermost when you get a reply in Emelia

This workflow allows you to send a message on Mattermost when a lead replies to your email. Emelia Trigger node: The Emelia Trigger node will trigger the workflow when a lead sends a reply to a campaign Mattermost node: This node will send a message to the Leads channel in Mattermost with the information about the reply. Based on your use case, you may want to send the message to a different channel. You may even want to use a different service. Replace the node with the service where you want to send a message.

Help me set up the n8n workflow "Send a message on Mattermost when you get a reply in Emelia" (https://n8n.io/workflows/1039). It uses: Mattermost. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.