First of all user must required valid sauce lab account which user can create from sauce lab web site.
To run QAS test on Sauce Lab user required to add following keys either in application.properties or in testrun_config.xml
where "remotedrivername" can be "firefoxRemoteDriver","chromeRemoteDriver" or any other valid remote driver
where "username" = sauce lab user name , "token" = sauce lab access key
User can also provide additional properties of driver using "browser.additional.capabilities" key
where "browser" can be "firefox", "chrome" or any other browser
Given below keys with proper values
Sample of application.properties and testrun_config.xml file is attached here.