On windows or ... ?
I am able to successfully use it on windows, I figured things out by looking at the help patch for it. (Still trying to get plugin~ working for LADSPAs tho, ... )
Essentially [vst~ 2 2 X:/VSTs/CamelCrusher.dll] works (on windows), that's the number of ins, outs and the path to the VST dll. Also adding the VST path to the list of paths PD searches, and just using the dll name without the path works too.
There are lots of things you can send to the first inlet to do things, and connecting the right outlet to print will give you useful info.
Sorry if any of this is misleading, it is all from memory...
On linux, I imagine you'll have to be running 32 bit, WINE, a vst compatibility library, etc etc to get this working.
Alternatively (if this is easier or not I don't know) there's a dssi-vst adaptor dssi plugin, and perhaps you could get plugin~ to load that?
have fun Rua HM.