The following page outlines how you can change your MobiControl password.
Go to http://portal.azure.com
Login with an email + your current password. The email is your username + @mobicontrol.taskletfactory.com. E.i. for the user TestUser, the email is TestUser@mobicontrol.taskletfactory.com
The next page will ask you for the current password and allow you to set a new password.