Cloud automatically creates subscription service entries on the "Service > Subscriptions" page when the customer accepts the proposal with one or more subscriptions in it, and you mark the opportunity as "Won." For example, if the proposal had 3 subscriptions, you would see 3 entries on the Subscriptions page.
Do the following to activate a subscription.
1/ Go to the details view of the subscription under "Service > Subscriptions."
2/ Set the start date, and the end date will populate automatically based on the subscription length.
3/ Enter the license for the subscription in the "Subscription key" text box. You will need to send this to the customer via email.
4/ If you want to renew the subscription automatically, click "None" next to Auto Renew in the Pricing section, specify the automatic renewal options, and click "Schedule."
Check out this article for more details.
5/ In the Files section, upload files, such as software agreements, email attachments, etc.
The status of the subscription will now be "Active."