My first post

so welcome to the stupid question dept...
I would like to run ST with SAM broadcaster, I downloaded the correct version, the default path was winamp but no Winamp is installed. It just made a folder... I opened the Winamp folder and can see a Dsp ST.dll fill in there ...nothing else
I went into Sam ..to Dsp plugin but it's grayed out and no option to tick ST plugin !
So what do I do next?
To be honest I've no idea do I move the dll file? To where?
Do I need to exit Sam and restart?
If someone could please provide a glaringly obvious step by step what to do next guide I'd be very grateful and promise to never ask again
It's the middle bit I'm having issues with.
Many thank in advance
K