how i can log as root

hi every body
how i can log as root on redhat 9
and how i can istall prog (not rpm) thank you for help

whay need to log as root?use "su" command instead.
for non rpm packages ,do you mean tarballs ( *.tgz , *.tbz2)? if you meean this uncompress it with the command
tar xvf package.tgz
gunzip(or bzunzip) package.gz(or .bz2)
then
cd package
read the README and INSTALL files and follow the instructions

thank you very much