sorry if my description is crap... but here it goes...
you have your screen showing all your sequencing and then on the left there are two columns, your "inspector" (to your furthest left) and where all your vsts show up (closest to your screen)... on the column with the vsts, your installed vst should show the device and its audio channel (below the device)... simply click on your audio device, and on your inspector, click inserts... 8 slots for inserts where your vst effects go are there... just click on one of the slots and plug in your vst effect...
hope that helps...