how do you use Last.fm ?

[Beauty4123]

heyy everyone.

i've signed up for a last.fm account, and downloaded it onto my computer, but how do i start listening (or scrobbling) to music? cuz i see in some ppl's signatures here have a chart of what they've recently played, so i was wondering how do i get that too? sorry if this is a stupid question to ask, lol and thanks to whoever can help me!