I followed the tutorial here: https://docs.wso2.com/display/AM191/Publishing+API+Runtime+Statistics+Using+WSO2+DAS#PublishingAPIRuntimeStatisticsUsingWSO2DAS-ConfiguringWSO2APIManager
On configuring WSO2 API Manager, I cannot seem to configure Analytics when I am inside the Admin Portal. Is there some configuration first that needs to be done?
You are looking at APIM 1.9.1 documentation. But it looks like you are using latest APIM which is 2.0.0. In 2.0.0 you can configure analytics in api-manager.xml only. See APIM 2.0.0 documentation.
One important thing about APIM 2.0.0 is, you don't need to configure DAS from scratch. Now DAS is pre-configured with required CApps and shipped as wso2am-analytics-2.0.0.zip. You can download it from APIM Product page itself.
