Sorry for delayed reply
2 ways to get to he manual :
1- The Manual is including as a.PDF file in your initial Kick 2 download once you expand the archive.
2- After Kick 2 is installed, you can access the manual from the plug-in GUI ( ref. screen shot )
Not quite sure to get your point here, Kick 2 is not a sampling tool, you can design your own Kicks and render them as audio files ( using the Render option ( right from the compressor section ) ).
As for the sounds import feature, you can add your own "clicks" sounds to Kick 2 by "drag & drop" your own audio files on the "Click" browser panels and then use them for kick sound design.
Hope that helps I moved your post in the Plugin/Kick Synth topic since the Kick 2 Beta area is more for reporting on the development versions.