What OS are you running?
On a PC, you access VST Instrument Rack by pressing F12.
This will bring up instruments only, such as HALion and synths.
Effects like compressors and delays are accessed by clicking on an insert to an audio channel, group track or effect track.
I think - and do not take this the wrong way - that you really need to spend some serious time with the manual.
I could wear out my fingers typing, and still not cover everything you need to know