API Center - enable feature flag in Azure portal link

Author: mikebudzynski

articles/api-center/set-up-api-center.md

@@ -47,7 +47,7 @@ After you've been added to the API Center preview, you need to register the **Mi
 
 ## Create an API center
 
-1. [Sign in](https://portal.azure.com) to the portal. 
+1. [Sign in to the Azure portal using this link](https://aka.ms/apicenter/azureportal).
 
 1. In the search bar, enter *API Centers*. 
 
@@ -242,4 +242,4 @@ In this tutorial, you learned how to use the portal to:
 > * Add information about API environments and deployments
 
 > [!div class="nextstepaction"]
-> [Learn more about API Center](key-concepts.md)
+> [Learn more about API Center](key-concepts.md)