Running RedHat Linux 2.4.18-13 reconfiguring kernel

Hello Managers;
I'm new to Linux and in the need of reconfiguring the kernel. In Solaris
I will do a "boot -r" from the "Ok>" promt and that will do it, just a way
of doing it.

But in Linux I do not see a way of doing it. 
I found something in the Internet which was stating to do the following:

cd /usr/src/linux

make xconfig

But I don't have in my installation the directory "linux" mentioned above
(/usr/src/linux) however
I do have (/usr/src/redhat) and some other dirs under redhat.

I was checking other boxes we have linux install and I don't see the
/usr/src/linux dir.

Could someone share some information on how to rebuild the kernel under the
version of
linux I'm runing, is it something easy like in Solaris?

Thanks,
Vinnie 

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