One possible solution is open new browser and log in with different user.
But if we want to log in as different user in the same browser then other workaround is using direct URL in address browser, I opened my SP 2010 site and check the URL – “_layouts/closeConnection.aspx?loginasanotheruser=true” , I copied this URL and appended to my 2013 site url and it worked well.
Only thing SP 2013 added automatically 15 hive in URL so URL became “_layouts/15/closeConnection.aspx?loginasanotheruser=true”.
Enjoy reading J
Feel free to comment / feedback if any or if you have any query J