First you need to edit /etc/apt/sources.list and point it to testing or unstable. (I'm assuming that you've got a working network connection.) Then run "apt-get update". After that you can run "apt-cache search kernel-image" to see what ready-compiled images are available (or if you need to compile your kernel from source, run "apt-cache search kernel-source").
Installing a pre-compiled kernel-image is a simple matter of running "apt-get install kernel-image-[version]". For compiling kernel from source in Debian there are several guides available -- to find some of them, use the search engine here at LinuxQuestions.org.
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