1st off welcome to RR your journey has only just begun.
when you installed RR you hopefully see 4 icons on your desktop , if not deselected when running the installer.
RR / Skin Editor / Skin tool / RRconfig
for now rrconfig is the app you want , this holds all the settings needed to run RR .
depending on your OS, depends on how things are placed on your system
if in profiles mode you will find the skin folder in MY Docs/RR/Skins
in Legacy mode Programfiles/RR/skins
as you have picked alpine skin , which is a very old s, so you may or may not find things working correctly with the lastest RR
just drop the alphine skin folder into the rr skins folder , go through rrconfig , ,,
if still stuck we are all here to help