Dan are you using Bloodnok's AWS system or the one that's in the Railwaves payware signal pack ?
Bloodnok's system just requires you to place one of his AWS ramps before the signal you want it to use .
The permanent magnet is used is situations where you only want to give a driver a warning . Like on the approach to an advance speed restriction board (upside down yellow triangle) or at the warning board for a temporary speed restriction (track works etc) or at on the approach to a 2 aspect termination signal (this only shows red or 1 yellow)
This will only operate in one direction of travel .
You need to place this with the angled chequer plate facing oncoming trains
Permanent magnet Bidirectional .
Same as above but will give a warning indication in both directions of travel and doesn't matter which way it faces on the track .
AWS Ramp :
This is the one you need to place before one of Bloodnok's signals (my Dorman signals use the same scripting and work the same as Bloodnok's) .
This will only work in one direction of travel .
Place the chequered plate end facing towards oncoming trains about 185 metres before the signal .
AWS Ramp bidirectional :
Used in situations on lines where you have trains travelling in both directions over the same line .
An easy way to illustrate it's use :