Installed SQL Express 2012 with SSMS 2012. When launching SSMS, I noticed the Server Type is greyed out. Unable to make selection to locate SQL instances.
Can you post a screenshot?
Ah, well SQL Server Express doesn't support any other type. Database Engine is therefore the only one which is why the option is greyed out.
As for servername, try
.\SQLEXPRESS
you can also check in Windows Services to get the name of the server, if it is not SQLEXPRESS
Thank you!