Wanted to do the hands on RDS lab but no account ID was shown (only username and password) for log in purposes to AWS. Can someone please fix it or let us know how to proceed. Thanks

You can either click on the "Open Link In Incognito Window" button, which will copy a URL to your clipboard that you can paste in the address bar of another window. Or else you can right-click on that button and choose the option to open it in a new tab (or Incognito Window if you are using Chrome).