I was installing a program called qt by I think troll tech. anyway the instructions say

In .profile (if your shell is bash, ksh, zsh or sh), add the
following lines:

QTDIR=/usr/local/qt
PATH=$QTDIR/bin:$PATH
MANPATH=$QTDIR/doc/man:$MANPATH
LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH

export QTDIR PATH MANPATH LD_LIBRARY_PATH

Well I am not sure but I think i found the file as .bash_profile
Question1 is that the file they are reffering to
Question2 after i edit this do i have to change the mode on the file.

[oblivious69]

from the man pages: When bash is invoked as an interactive login shell...it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile, in that order, and reads and executes commands from the first one that exists and is readable.

So, put it in /etc/profile if you want everyone to have access to it or you can just add it to the .bash_profile.

As for permissions, make sure .bash_profile is world readable. The permissions should look like "-rw-r--r--".