WorkingConventions/Git: how to provide patches w/o account on darcs.haskell.org?

[Karel Gardas]

Hello,

I've read 
http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions/Git and it 
contains following sentence:

"(where <account> is your account on darcs.haskell.org; omit this step 
if you don't have one, you can still submit patches via the mailing list 
or send a pull request to get your changes in GHC)."

As I would like to provide a patch or two and yet I'm complete git 
novice able to just clone and switch branches, I would appreciate if 
someone more elaborate on this "or send a pull request to get your 
changes in GHC". I guess I shall use github.com for this. If so, then 
from what project I shall clone to my github's GHC copy? As I said, I've 
never seriously used git before nor github.com so some more writing 
about it on the same page would be fantastic to have.

Thanks a lot!
Karel