There's no good way to do this. Get someone to install the SQL Server Enterprise Manager on your computer so you can use their query builder. Anything less is pain you don't need.
Their query builder looks somewhat similar to the Access query builder; not identical of course, but similar enough to get you started.
As an alternate, you can use the query builder to build an UPDATE query in Access, then go to the "SQL view" and look at the SQL it generates. For simple things they will be identical SQL syntax, for complex things there will be some serious differences. For the record (if you're googling at all) Access uses "JET SQL" and SQL Server uses "T-SQL" or "Transact SQL", and there are differences between these two.
There's no shortcut to learning, but I hope I've helped you find a few tools to make the learning easier. Also, DEFINITELY get Enterprise Manager. At worst it's a $50 purchase for the "SQL Server Developer Edition", at best you have a site license so it won't cost anything.