[Tex/LaTex] How to reduce top margin in scrlttr2

scrlttr2spacing

i'm having problems searching for the solution. I'm writing a simple letter and I see that top margin is too large.
I tried

\setlength\topmargin{-50pt}

recommended in this answer, but nothing happened.
I also tried

\@setplength{refvpos}{5cm}

recommended in but it seems to make the body of the letter go up, instead
of making the whole letter (including address and subject).

Thanks!

Best Answer

You can use

\setkomavar{fromname}{%
  \vspace{-\useplength{firstheadvpos}}%
   Me, I  and myself}

or if you want to set the KOMA length directly

\makeatletter\@setplength{firstheadvpos}{0cm}\makeatother

However, setting directly firstheadvpos should be done in a lco file (letter class options).