Seems you have already installed the AMQP Messaging Modular Input and received data through it. Have you configured the add-on properly? As this is a Modular Input , you can then configure your AMQP inputs via Manager->Data Inputs->AMQP. The field entry should be straightforward and intuitive for anyone with basic experience with AMQP.
If the add-on configuration does not work for your data format, you can also create your own custom sourcetype so that Splunk can correctly perform field extraction and transformation of your data.