ShareWebDb_log.ldf is 97GB - How to reduce?

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http://serverfault.com – We run an SBS 2008 server with WSS. On the drive I have set aside for WSS, I'm fast running out of space due to the ShareWebDb_log.ldf file: I've tried doing to do what I've read online - change the recovery mode, backup and truncate - but I can't actually see how I do this via the SQL Server Management Studio tool. Can anyone shed any light? The database for this file does not show in the list, and I cannot expand Management > SQL Server Logs (because it's too large?). (HowTos)