As mentioned at the beginning of this section, when you sign up for Splunk Cloud, an email will be sent to your registered email ID to let you log in to your Splunk Cloud account. You will also receive an app unique to you to help you configure your forwarded to send data to your Cloud as shown in the Cloud documentation:
http://docs.splunk.com/Documentation/SplunkCloud/latest/User/GetstartedwithSplunkCloud
Note: https://splunkbase.splunk.com/apps/#/product/cloud is a great place to see what apps are Cloud-compatible or what apps are available specifically for Splunk Cloud.