Programing AVR fuses is something you should understand well before hitting button. Lots of starters burned out by trying and failing. So there is a good advice – read, understand and follow documentation. But we all agree that official documentations and datasheets are quite boring to read. This is why it is good to look around maybe there are some great tutorials on this subject.
Embedder’s life have posted a short tutorial about AVR Fuses. It goes through understanding how fuses work, what problems you may face by setting one or another fuse. And finally real examples on how to program fuses using avrdude command line tool.