How will you take SQL Server in single user mode ?

SQL Server Configuration Manager > SQL Server Services > SQL Server (InstanceName) > Properties > Advanced > Startup Parameter >

For SQL Server 2005 and 2008

 Just put   -m;  then Save/Ok
Example:
-m;-dC:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master.mdf;-eC:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Log\ERRORLOG;-lC:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\mastlog.ldf

For SQL Server  2012:
Click Startup parameter and just put -m;

Tips:
You should stop other sql server services to get connect with SQL when sql server is in single user mode