Hey there, RSS!
note
Make sure you already have rss installed before proceding.
Start by adding a LocalScript to StarterGui and put this:
local rss = require(path/to/rss)
local frame = Instance.new("Frame")
frame.Parent = game.StarterGui
rss.style({padding = 1, corner = 5}, frame)
You should see a Frame pop up with corner radius and padding.
In RSS, we style components with a single function called rss.style() which reads a dictionary of styles you pass and an element.
Learn more about rss.style() in the API page.