Update sign-up link

Author: ntrogh

articles/lab-services/add-lab-creator.md

@@ -60,7 +60,7 @@ When educators sign in to the Lab Services portal, they are prompted for their e
 
 ![Error message](./media/how-to-configure-student-usage/cant-find-account.png)
 
-To sign up for a Microsoft account, educators should go to [http://signup.live.com](http://signup.live.com).  
+To sign up for a Microsoft account, educators should go to [https://signup.live.com](https://signup.live.com).  
 
 ### Using a GitHub Account
 
@@ -81,4 +81,4 @@ See the following articles:
 - [As a lab owner, create and manage labs](how-to-manage-labs.md)
 - [As a lab owner, set up and publish templates](how-to-create-manage-template.md)
 - [As a lab owner, configure and control usage of a lab](how-to-configure-student-usage.md)
-- [As a lab user, access labs](how-to-use-lab.md)
+- [As a lab user, access labs](how-to-use-lab.md)