Messages in Communication - Customs Declaration

Hi

I want to understand the steps why my message in communication tab for export declaration is populating, and also how can I see the message log for ascertaining what could have gone wrong? I referred the https://archive.sap.com/discussions/thread/3657924

and tried to follow the direction but failed to populate and also tried to see where is the scroll like icon, could not find. Can any one help please?

Thanks in advance,

Kid.