SQLDB is the name of the database you will work on. On the ISQL01 SQL Server, there are multiple databases, but the SQLDB database has been created just for you to do your homework.
select * from Elections2000
Type Ctrl-E to run the query (or click on the little green arrow on the menu). If everything worked alright, you should get back the results of the query - 3 tuples.
Congratulations - you just run your first query.