Update usage.md

Author: craigshoemaker

articles/sre-agent/usage.md

@@ -46,7 +46,7 @@ You need to grant your agent the correct permissions and access to the right nam
 
 To create an SRE Agent, follow these steps:
 
-1. Go to the Azure portal and search for and select **Azure SRE Agent**.
+1. Follow the link provided in your onboarding email to access the Azure SRE Agent portal window.
 
 1. Select **Create**.
 
@@ -132,4 +132,4 @@ To set up SRE Agent with PagerDuty, you need a PagerDuty API key.
 
 ## Related content
 
-* [Azure SRE Agent overview](./overview.md)
+* [Azure SRE Agent overview](./overview.md)