How to shrink SQL Server Transaction Log file in MS SQL Server 2012

On Transact-SQL Window, run the below statement;

ALTER DATABASE MyDatabaseName SET RECOVERY SIMPLE        

DBCC SHRINKFILE (MyDatabaseName_Log, 1) 

Go                  

Once the Log File has been truncated, run the below command to put it back the database into full recovery mode using below statement;

ALTER DATABASE MyDatabaseName SET RECOVERY FULL        

GO