multibooting my own kernel source with grub

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http://forums.fedoraforum.org – so i installed fedora11 live CD into a formatted hdd in my extra computer. i am new to this so i just followed the instructions and got that to work. now i am trying to learn more, so i downloaded the kernel source from kernel.org and tried to compile and make an image. i made an image and am trying to mount it so i can use the kernel. i am now stuck at what to do with grub. how do i boot another kernel. I did not partition the harddrive before hand because i didn't know i was going to do this. should i reformat everything? (HowTos)