Let's start with accessing your instance. Once you've received the acknowledgement that your Splunk Cloud (trial) instance is ready, you can point your browser to the provided URL. You will notice that the web address for Splunk Cloud is prefixed with a unique identifier that qualifies your particular instance (this is actually the server name where your instance resides):
And the Log In page is a bit different in appearance (from Splunk Enterprise):
Once you are authenticated, we see the Splunk Cloud main page:
First things first. Looking across the task bar (at the top of the page), if you click on Support & Services and then About, you will notice that the Splunk Cloud version is 6.6.3.2, which is NOT the latest on-premise or locally installed version: