0321 chunkmethods (#6520)

### What problem does this PR solve?

#6061 

### Type of change


- [x] Documentation Update

docs/guides/dataset/construct_knowledge_graph.md

@@ -68,6 +68,10 @@ In a knowledge graph, a community is a cluster of entities linked by relationshi
    _A **Knowledge graph** entry appears under **Configuration** once a knowledge graph is created._
 
 3. Click **Knowledge graph** to view the details of the generated graph.
+4. To use the created knowledge graph, do either of the following:
+   
+   - In your **Chat Configuration** dialogue, click the **Assistant Setting** tab to add the corresponding knowledge base(s) and click the **Prompt Engine** tab to switch on the **Use knowledge graph** toggle.
+   - If you are using an agent, click the **Retrieval** agent component to specify the knowledge base(s) and switch on the **Use knowledge graph** toggle.
 
 ## Frequently asked questions