RUN Sotre Operation Admistrator
Click File -> Connect then you will get a window
Enter ur Server name
Enter ur user name and password of sql server (if ur using trusted connection then just select the windows authontication)
Select ur database and click ok.
After the successfull connection u can see the server name and database name on the status bar
click the query -> new from menu then you will get the query window
Copy and paste the following query to that window
DELETE FROM Journal WHERE [Time] < CONVERT(DATETIME, '2008-11-29 16:39:40', 102)
you can edit the date but dont make any changes in query date format should be in yyyy-mm-dd
finally you can press F5 or choose RUN from Query menu to run the query.
All the best