On launching the AMQP app, it takes me to the below UI.
I do not think that this belongs to AMQP. It is the UI of website Monitoring app.
Can somebody please help me here?
A TA like the AMQP modular input doesn't have a UI, out of the box it's not even set as visible in the apps dropdown in the top left corner.
See https://splunkbase.splunk.com/app/1812/#/details for setup and configuration.
How then do we run the app and set up the configurations?
Browse to Data Inputs -> AMQP
If you read the docs this is mentioned in the "Configuration" section