1. install sampletank the main prog to a normal folder of your choice then when it asks for the VST folder chose the folder where u have all your vsts installed.
2. open fl studio go to "channels" > "add" > "more" > "refresh" > "fast scan" then enable the "F" on sampletank that shows in the plugin list.
3. go to channels select sampletank
4. creat a banger (this is the most difficult part of it lol)
^^^ Doesn't get any easier than that ... And i'm pretty sure it asks you
what VST folder you want to install it in when you install it as well as does
pretty much every store bought vst installation usually.