text: Q:
  
  How to Change a Windows Azure subcription Service Administrator?
  
  I can add and remove a co-administrator, but what about the service administrator?
  Mainly I want to change the service administrator to another Live ID.
  Note that I am using a Windows Azure Pass (i.e. 40 days free service).
  
  A:
  
  I had the same question (ish): I wanted to change the service administrator for a subscription, but I am not using the 40 days free pass.
  The blog post that OperatorOverload recommends in her or his answer mentions that "only the Account Owner can reassign a subscription’s Service Administrator" but does not go on to explain how that is done. 
  Here is the (current at 17/08/15) process, the service administrator:
  
  signs in to https://portal.azure.com/
  goes to the billing blade;
  
  selects the service to change;
  
  scrolls down and clicks the 'properties' tile;
  
  clicks the edit service admin button;
  
  enters the email address of the new service administrator; and finally
  clicks the OK button.
  
  