The Package installer refered in the first reply does install LibreOffice in 32 bits, if your system is 32bits, and you can, if needed, install the spanish localization files, from the Package installer.
If you do that, all the installed LibreOffice apps will appear in your menu.
If you installed libreoffice from .deb files, probably from Escolas Linux web site, try Menu > refresh menu. All new entries should appear in your menu.
To launch libreoffice without a menu: use the terminal and run:
libreoffice