Subscription entitlements do not get used until they are attached to a system that needs it. Attaching a subscription is the next step after registration to RHSM.
From the Systems
page, click the appropriate system.
Click the Subscriptions tab.
Click Attach Subscriptions.
Select the appropriate subscriptions, and click Attach Subscriptions.
Note: By default, all subscriptions attached to your account populate when you attach subscriptions. Selecting the Only show subscriptions that match this subscription type option can prevent you from attaching subscriptions that are not usable by the system.