Now that you've loaded Sampletank from within Logic, you should be able to see the arrow that Gary and Redlogic are talking about.
When you open a 3rd party plugin within Logic, Logic should automatically 'wrap' it with a thin black border - as seen in Redlogic's screenshots. The wrapper has its own drop down menus and extra functionality, which is what Gary's instructions apply to.
When you open SampleTank the way Redlogic described, does Logic wrap it with a black border? It should have:
* a link icon
* bybass buton
* 4 dropdown menus
If you can see those dropdown menus, Gary's instructions will work for you now.