Where is 'Indent' or 'Skip' ?

[Fernando Basso]

Lyx help mentions: Document -> Settings -> Text_Layout -> Indent or 
Skip. I can't
find it (lyx 1.6.10 - arch linux). It mentions 
\setlength{\parindent}{Length}, but I
can't find the place to paste it.

What I am trying to accomplish is separate paragraphs and indent the
first paragraph, even if it doesn't come after another paragraph.