Clear out remnant LDF log files of Sharepoint DB not visible on SBS 2008 Domain Server?
I have never used SharePoint or worked with its databases specifically, but both links in your question indicate that you should be able to see, and work with, SharePoint databases in SQL Server Management Studio.

The fact that you cannot see them in your particular case most likely means that they are hosted by a different server instance – not the ...SBS\SBSMONITORING one you are connected to, according to your screenshots. If you do not know the name of the instance hosting your SharePoint databases, try looking it up in SQL Server Configuration Manager → SQL Server Services.

Once you have found out the name and connected to the right SQL Server instance, you should be able to follow the instructions you have discovered on the Web. But please read the answers on this question first to make sure you understand what you are doing and what the consequences may be:


Why Does the Transaction Log Keep Growing or Run Out of Space?