Merge data for multiple executions

This workflow demonstrates how to merge data for different executions. The Merge Data Function node fetches the data from different executions of the RSS Feed Read node and merges them under a single object. Note: If you want to process the items that get merged, you will have to convert the single item into n8n understandable multiple items.

Help me set up the n8n workflow "Merge data for multiple executions" (https://n8n.io/workflows/1160). It uses: . Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.