I was following the installation instructions for the jdbcunity multi-source plugin for SQuirelL SQL and it states that after I install it and set it up as a datasource, I should be able to see the following menu, where I can add multiple data sources to a query:

However, as seen below, mine doesn't have these...

What else do I need to do to get this working? The SQuirrel interface is soooo much better than MS-Access...