>>If your recovery model is "Full" you must have full backup of the database and backup of the LOG to shrink the file.
>>BTW there is no need to shrink the LOG.
>>Autogrowth is a resource eating task. If you Backup the LOG SQL Server can reuse its space.
>
>The recovery mode has been set to simple.
>
>If I wouldn't have shrunk that log, we would have run out of disk space. This wasn't making any sense to have half a terabytes of log for our development and test environments. This grows indefinitely if there is no procedure to take care of that. I always have this shrunk at midnight to 1 MB to start all over.

The autogrowth of the files you can set it in SSMS:
Right click on Database
Select Properties
Click on Files.
The you will see on the right part of the form "Autogrowth/Max size" column (I thing the Max Size is only in 2012, but I'm not sure).