How do i add fonts to LO Writer?

I want to add the fonts i have accumulated, to Writer… but can’t figure out how…

See related questions: How do I install new fonts to LibreOffice Writer? and Adding fonts to LibreOffice in Ubuntu 13.04 beta for Windows and Ubuntu Linux instructions.

As I know the fonts are added to the Operating System, not to the programs.

The programs use the fonts available in the OS.

See also → Tags, matching “font”