set up tool length offset and ref tool on mill

need step by step help. is this kinda correct?

1) z o longest tool (but where do i click to use that as reference tool)
2) touch off all other tools and press measure. to get negative number
i need step by step instructions for fanuc controller to get to buttons i need to press and how to do it thanks. my teacher was suppose to show me , i asked him 3 times already but he keep giving excuses. thanks

What fanuc controller do you have?

I didn't notice this was so old. I'm new to this. I hope you've figured it out by now.