Modifying a live linux kernel

Before reading this, I just need to say something: I’ve no idea of linux, I’ve no idea of programming, I’ve no idea of computers… Everything you read here might have been invented, so, please, do not reproduce what I write here. If you do, bear in mind that you do it under your own responsibility. In fact, what is a computer anyway? The other day we were having issues with a box that was used as a NFS box among other things.